diff --git a/Cargo.lock b/Cargo.lock
index a790240..f26df36 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -208,9 +208,9 @@ checksum = "904dfeac50f3cdaba28fc6f57fdcddb75f49ed61346676a78c4ffe55877802fd"
 
 [[package]]
 name = "bevy"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "55f08528a4e59d607460513a823b40f602d013c1a00f57b824f1075d5d48c3cd"
+checksum = "fea147ef1ebb92d41294cfad804c40de151b174c711ce6e0a4a40eba23eae1a4"
 dependencies = [
  "bevy_internal",
 ]
@@ -241,9 +241,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_animation"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e243169af495ad616ff701247c0d3e40078a26ed8de231cf9e54bde6b3c4bb45"
+checksum = "a4365465fca7bd78295eb81d0a04afc049399852793d562eb017849bb5d6c55e"
 dependencies = [
  "bevy_app",
  "bevy_asset",
@@ -259,9 +259,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_app"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "53d26d6ffdf493609d2fedc1018a2ef0cb4d8e48f6d3bcea56fa2df81867e464"
+checksum = "9e4ae0a6ed2adf3b153511b4645241660a93f747c05ecd1e5a909dafc803cad4"
 dependencies = [
  "bevy_derive",
  "bevy_ecs",
@@ -274,9 +274,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_asset"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3d8fb95306d5f18fa70df40632cd984993aeb71e91ce059ae99699098a4f9ce9"
+checksum = "2ec773c861a7e9d9978771f59f385500ec6da3a1ab5487705cddb054393d3d19"
 dependencies = [
  "anyhow",
  "bevy_app",
@@ -302,9 +302,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_audio"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eee08ac575397ce17477dd291862bafa15226334bdfb82c02bbc3d10bad7bdb8"
+checksum = "1e5cf4713a24f318841f73a9e030854cfd5bad46bc81fa1acc9590cdab053c6f"
 dependencies = [
  "anyhow",
  "bevy_app",
@@ -317,10 +317,22 @@ dependencies = [
 ]
 
 [[package]]
-name = "bevy_core"
-version = "0.8.0"
+name = "bevy_common_assets"
+version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c6712146d54fff9e1865362e9f39a7b63c7b037ddb72a3d7bb05b959213fb61e"
+checksum = "3f7be9ee39085d8319d5cd853447b0b5c4f8b4bfd647aec91e2bd996e9db67ef"
+dependencies = [
+ "anyhow",
+ "bevy",
+ "serde",
+ "serde_json",
+]
+
+[[package]]
+name = "bevy_core"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c53172003d5cde7780870b5403c66c8ede3581faf3e510e916d8b4baa5b538d2"
 dependencies = [
  "bevy_app",
  "bevy_ecs",
@@ -333,9 +345,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_core_pipeline"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "080bb00399b6d7697e505f871d67c6de8b52eb06b47b0cda2be80c2396805983"
+checksum = "5e60efd10d593f6d122f2687f74c09ad55835a8f999c35bed6380ddd8e6ff7f2"
 dependencies = [
  "bevy_app",
  "bevy_asset",
@@ -351,9 +363,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_derive"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a4b8f0786d1fc7e0d35297917be463db3d0886f7bd8d4221ca3d565502579ffb"
+checksum = "0e6345431bbe6d7b6c165cd860ecd0b35da929779571259c5df970ac256d45f9"
 dependencies = [
  "bevy_macro_utils",
  "quote",
@@ -362,9 +374,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_diagnostic"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adab74ee5375fbf5d2b1d3da41de8d1491a8a706d17441b5e31214b65349d692"
+checksum = "58ac9f4c2815f412be4b6e21e4b299cdafa710f651d064f6d40b2a8377a0d17c"
 dependencies = [
  "bevy_app",
  "bevy_ecs",
@@ -375,9 +387,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_ecs"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a5643dc27b7d6778e3a66c8e0f6ad1fd33309aa2fa61d935f360ccc85b7be6a2"
+checksum = "c174066a24ed8a14d15ea58b0aea1c1f5c763f4bb36ebdc2b1dc78026007d0f5"
 dependencies = [
  "async-channel",
  "bevy_ecs_macros",
@@ -394,9 +406,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_ecs_macros"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a5f2f12677f8725d40930d0a19652f007fe0ef5ac38e23817cfc4930c61f5680"
+checksum = "cc50c39e49e8febccc74e8e731680adb0cb4aef1f53275740cbaa95c6da71f4f"
 dependencies = [
  "bevy_macro_utils",
  "proc-macro2",
@@ -419,9 +431,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_encase_derive"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "76a767adc36ce1fc917a736843b026d4de7069d90ed5e669c852481ef69fd5aa"
+checksum = "68bc194009c5e9b97da64a08142dd183c264885d99c985cf849868103018adf1"
 dependencies = [
  "bevy_macro_utils",
  "encase_derive_impl",
@@ -429,9 +441,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_gilrs"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "963940426127533164af2a556971a03c493143c0afb95afadb4a070b6ab8c3df"
+checksum = "cb15a3427d9707be92b457e5d66900b02d853b475c21dd8662bdda387ba9f24e"
 dependencies = [
  "bevy_app",
  "bevy_ecs",
@@ -442,9 +454,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_gltf"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "150cc6782c4472600c2ade5d78c6ce481c992690f0499e63765aba752d7e0f04"
+checksum = "79db7d7e71b47a69953fbe8407ded5c6308eaeecf9a05efd5dfb42992f400a16"
 dependencies = [
  "anyhow",
  "base64",
@@ -471,9 +483,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_hierarchy"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8e2e4c20d7c843cd26ef3c5d7b4c20e3e32c275943e2437ecaca1cfd6cfe3b30"
+checksum = "5eb1ec76099ea5a716de08ea42ff41f036ebe2502df1d569168b58f16458a85e"
 dependencies = [
  "bevy_app",
  "bevy_ecs",
@@ -484,9 +496,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_input"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a11c70573fb4d4c056ba32cfa553daa7e6e1245cb876ccfbe322640928b7ee1c"
+checksum = "1821c4b760ba6ddb4fe61806e9cc33f40b09a884557aca4553a29b8c7d73c6b4"
 dependencies = [
  "bevy_app",
  "bevy_ecs",
@@ -496,9 +508,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_internal"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0d603b597772130782eab6e604706cbb764fb037f9cf0a1904b6f342845b6f44"
+checksum = "ee63ad1e3f95a26ff2c227fadb1534a7bfe3a098e0e45c347f2f2575a573d9bc"
 dependencies = [
  "bevy_animation",
  "bevy_app",
@@ -534,9 +546,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_log"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8cafb12fc84734236e36f407ab62c72d5d4279fa4777e40a95d7cc973cbabcd1"
+checksum = "092daf498887814a064331dfcd1cf487a5ddab01fd38629b84a35b8b664462a1"
 dependencies = [
  "android_log-sys",
  "bevy_app",
@@ -549,9 +561,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_macro_utils"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d081af83b701e16cad209255ba6b383744dfa49efa99eb6505989f293305ab3"
+checksum = "43fb5137e5198302d7c6c33d1e454cf48a586e7c6fd12f4860f12863951e16b9"
 dependencies = [
  "quote",
  "syn",
@@ -560,18 +572,18 @@ dependencies = [
 
 [[package]]
 name = "bevy_math"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "db5394e86c5708d3aa506c6e98ec4ed2a4083a7a018c6693d9ac0e77ebfabfc2"
+checksum = "531f2b90c7e861a96f418b3d560131b3354c5e67a67eba3953a45a56ea0114d2"
 dependencies = [
  "glam",
 ]
 
 [[package]]
 name = "bevy_mikktspace"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "40b299a61175a6f7e7398f83cd5b50920fd8bad4df674e614ad94f25f8426509"
+checksum = "941e7d3d4e1dbb735f040e4cdc1558be1d3c38d43f1d9fdbb039c39a7849a00b"
 dependencies = [
  "glam",
 ]
@@ -599,9 +611,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_ptr"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d92d5679e89602a18682a37846573dcd1979410179e14204280460ba9fb8713a"
+checksum = "9960c19e582b43cebe1894b6679520a4f50802d1cc5b6fa432f8d685ed232f09"
 
 [[package]]
 name = "bevy_rapier2d"
@@ -618,9 +630,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_reflect"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "08798e67f2d4e6898ef117d8c99cf3b50a8eebc8da4159e6dad2657a0fbe9a4e"
+checksum = "3fc689dd7a7df3b3768884a4754711d406aa302ea48da483c03b52715fa95045"
 dependencies = [
  "bevy_ptr",
  "bevy_reflect_derive",
@@ -637,9 +649,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_reflect_derive"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "19209a7f0238053802b7de04e6724bd90d4ed7d90e87101dbd1b64cca64ff694"
+checksum = "8c36fa5100832c787c10558d31632ddc454c221e8dfacbbef836938f59614754"
 dependencies = [
  "bevy_macro_utils",
  "proc-macro2",
@@ -650,9 +662,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_render"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bb49530388ef17cff3fb8bd5e47372fb3cfeb4befc73e3036f6462ac20f049ef"
+checksum = "600bcef85c7efac6e38ed725707f0e5b7c59b510430034ba2f743f472493f845"
 dependencies = [
  "anyhow",
  "bevy_app",
@@ -693,9 +705,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_render_macros"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e7d0b7a51fa819c20c64f43856c5aaea40f853050bbb09b9ba3672e5ff2688a5"
+checksum = "1be90adc9e5d5808833e363670818da5fe68ccafd7ca983a457f90957d2a430b"
 dependencies = [
  "bevy_macro_utils",
  "proc-macro2",
@@ -705,9 +717,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_scene"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0064d73ebb0de39901478b493604a1a6d448fd337b66803004c60f41f1fa6c37"
+checksum = "a045d575d2c8f776d8ea965363c81660243fefbfc3712ead938b00dfd6797216"
 dependencies = [
  "anyhow",
  "bevy_app",
@@ -753,9 +765,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_tasks"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ff874c91a36eaac3ef957c6f3b590fb71332d9d136671cc858847d56fe9f80a3"
+checksum = "719b753acb3d5b9dbfd77038560fe1893c17d4ee0a4242c2ee70da9d59430537"
 dependencies = [
  "async-channel",
  "async-executor",
@@ -768,9 +780,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_text"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ef05a788c2c04aaa5db95b22a8f0fff0d3a0b08a7bcd1a71f050a628b38eec6e"
+checksum = "c265b7515faf55a3b92fd6ce0ab65dd246f247e11d737d6f5cdaf49c2be42c63"
 dependencies = [
  "ab_glyph",
  "anyhow",
@@ -791,9 +803,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_time"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74ec681d641371df81d7bfbcb0eea725ed873f38a094f34b5f7b436f0889e77c"
+checksum = "22830665b8476292b861216383fd79922aef2b540f9fd09d49144e3e5e94550e"
 dependencies = [
  "bevy_app",
  "bevy_ecs",
@@ -804,9 +816,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_transform"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "42e1528e35f30bede46a50ee4134f150efc01f5c1002c340b3b2e6a0bfcb8aa5"
+checksum = "a4bb8760f03e9667e7499a5ceec1f7630fc3e45702781ac0df56cb969e8ae668"
 dependencies = [
  "bevy_app",
  "bevy_ecs",
@@ -845,9 +857,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_utils"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8bda6dada53e546845887ae7357eec57b8d547ef71627b716b33839b4a98b687"
+checksum = "f6e9aa1866c1cf7ee000f281ce9e90d02d701f5c7380a107252017e58e2f5246"
 dependencies = [
  "ahash",
  "getrandom",
@@ -874,9 +886,9 @@ dependencies = [
 
 [[package]]
 name = "bevy_winit"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "57537a56ac4f4e1ffcad95227bcab37cd17b51770dacff82374a2d88be376322"
+checksum = "98b15fee4b75472e3441b0c7221467303e4ce59b342a94a328e447e7cdb5a43c"
 dependencies = [
  "approx",
  "bevy_app",
@@ -898,12 +910,15 @@ version = "0.1.0"
 dependencies = [
  "bevy",
  "bevy-inspector-egui",
+ "bevy_common_assets",
  "bevy_rapier2d",
  "cpal 0.14.0",
  "crossbeam-channel",
  "hexodsp",
  "rand",
  "rand_distr",
+ "rapier2d",
+ "serde",
  "ticktock",
 ]
 
diff --git a/Cargo.toml b/Cargo.toml
index f79d249..df12e56 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,12 +6,15 @@ license = "AGPL-3.0-only"
 edition = "2021"
 
 [dependencies]
-bevy = "0.8.0"
+bevy = "0.8.1"
+bevy_common_assets = { version = "0.3.0", features = ["json"] }
 bevy-inspector-egui = "0.12.1"
 bevy_rapier2d = "0.16.2"
 crossbeam-channel = "0.5.6"
 rand = "0.8.5"
 rand_distr = "0.4.3"
+rapier2d = "0.14.0"
+serde = { version = "1.0.144", features = ["derive"] }
 
 [target."cfg(not(target_arch = \"wasm32\"))".dependencies]
 cpal = "0.14.0"
diff --git a/README.md b/README.md
index bb59e47..17112e6 100644
--- a/README.md
+++ b/README.md
@@ -5,16 +5,19 @@
 * **Move**: arrows
 * **Switch character**: Tab
 * **Level up**: Enter (when character is white)
+* **Reset**: R
 
 ## TODO
 
 * name
-* color filters
+* more filters
+* despawn black characters
+* despawn character when too far
 * level design
-* (?) can jump only from a surface (no mid-air jump)
 * (?) multiplayer
-* level reset
 * more audio
+* "jumpable" component to avoid jumping on sensors
+* bug: in level2, move the blue character to win, then reset. The characters are lighter than expected.
 
 ## Build
 
diff --git a/assets/bevy.png b/assets/bevy.png
new file mode 100644
index 0000000..9cd3f1e
Binary files /dev/null and b/assets/bevy.png differ
diff --git a/assets/game.levels.json b/assets/game.levels.json
new file mode 100644
index 0000000..549c17b
--- /dev/null
+++ b/assets/game.levels.json
@@ -0,0 +1,119 @@
+{
+	"levels": [
+		{
+			"comment": "Movement tutorial",
+			"platforms": [
+				{"pos": [0, -256], "size": [800, 16]}
+			],
+			"characters": [
+				{"pos": [0, -192], "color": [1,0,0,1]},
+				{"pos": [-128, -192], "color": [0,1,0,1]},
+				{"pos": [128, -192], "color": [0,0,1,1]}
+			],
+			"absorbing_filters": [],
+			"rotating_filters": [],
+			"texts": [
+				{
+					"pos": [0, 0],
+					"font_size": 32,
+					"text": "Combine the colors to synthetize a white light.\nUse arrows to move."
+				}
+			]
+		},
+		{
+			"comment": "Switch tutorial",
+			"platforms": [
+				{"pos": [0, -256], "size": [800, 16]},
+				{"pos": [128, 256], "size": [96, 16]}
+			],
+			"characters": [
+				{"pos": [0, -192], "color": [0,1,0,1]},
+				{"pos": [-128, -192], "color": [1,0,0,1]},
+				{"pos": [128, 320], "color": [0,0,1,1]}
+			],
+			"absorbing_filters": [],
+			"rotating_filters": [],
+			"texts": [
+				{
+					"pos": [0, 0],
+					"font_size": 32,
+					"text": "Press Tab to switch."
+				}
+			]
+		},
+		{
+			"comment": "Absorbing filter tutorial",
+			"platforms": [
+				{"pos": [0, -256], "size": [800, 16]},
+				{"pos": [0, -128], "size": [800, 16]}
+			],
+			"characters": [
+				{"pos": [-128, -192], "color": [1,0.64,0,1]},
+				{"pos": [128, -192], "color": [0,0.37,1,1]}
+			],
+			"absorbing_filters": [
+				{
+					"pos": [0, -192],
+					"size": [16, 112],
+					"color": [1,0,0,1]
+				}
+			],
+			"rotating_filters": [],
+			"texts": [
+				{
+					"pos": [0, 0],
+					"font_size": 32,
+					"text": "Press R to reset."
+				}
+			]
+		},
+		{
+			"comment": "Rotating filter tutorial",
+			"platforms": [
+				{"pos": [0, -256], "size": [800, 16]}
+			],
+			"characters": [
+				{"pos": [0, -192], "color": [1,0,0,1]},
+				{"pos": [-128, -192], "color": [1,0,0,1]},
+				{"pos": [128, -192], "color": [1,0,0,1]}
+			],
+			"absorbing_filters": [],
+			"rotating_filters": [
+				{
+					"pos": [0, -64],
+					"angle": 45
+				}
+			],
+			"texts": [
+				{
+					"pos": [0, 0],
+					"font_size": 32,
+					"text": "Let's rotate the hue!"
+				}
+			]
+		},
+		{
+			"comment": "Game over",
+			"platforms": [
+				{"pos": [0, -256], "size": [800, 16]}
+			],
+			"characters": [
+				{"pos": [0, -64], "color": [1,0,0,1]}
+			],
+			"absorbing_filters": [],
+			"rotating_filters": [],
+			"texts": [
+				{
+					"pos": [0, 128],
+					"font_size": 48,
+					"text": "Thank you for playing!"
+				},
+				{
+					"pos": [0, 0],
+					"font_size": 32,
+					"text": "There is no more light to combine."
+				}
+			]
+		}
+	]
+}
\ No newline at end of file
diff --git a/assets/init.hxy b/assets/init.hxy
index 8ba0f92..3700a2f 100644
--- a/assets/init.hxy
+++ b/assets/init.hxy
@@ -1 +1 @@
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diff --git a/index.html b/index.html
index 30034f5..3b956aa 100644
--- a/index.html
+++ b/index.html
@@ -2,6 +2,7 @@
 <html lang="en">
 	<head>
 		<meta charset="UTF-8"/>
+		<title>Bevyjam</title>
 	</head>
 	<body>
 		<script type="module">
diff --git a/src/audio.rs b/src/audio.rs
index f8400f6..767b309 100644
--- a/src/audio.rs
+++ b/src/audio.rs
@@ -33,9 +33,18 @@ pub fn setup(event_channel: Receiver<AudioMsg>) {
 		let color_mix_b_gain = color_mix.inp_param("gain3").unwrap();
 		let jump_ad = NodeId::Ad(0);
 		let jump_ad_trig = jump_ad.inp_param("trig").unwrap();
+		let switch_ad = NodeId::Ad(1);
+		let switch_ad_trig = switch_ad.inp_param("trig").unwrap();
+		let fusion_ad = NodeId::Ad(2);
+		let fusion_ad_trig = fusion_ad.inp_param("trig").unwrap();
+		let fusion_ad2 = NodeId::Ad(3);
+		let fusion_ad2_trig = fusion_ad2.inp_param("trig").unwrap();
 
-		for (_tick, _now) in Clock::framerate(10.0).iter() {
+		for (_tick, _now) in Clock::framerate(20.0).iter() {
 			matrix.set_param(jump_ad_trig, (0.0).into());
+			matrix.set_param(switch_ad_trig, (0.0).into());
+			matrix.set_param(fusion_ad_trig, (0.0).into());
+			matrix.set_param(fusion_ad2_trig, (0.0).into());
 
 			if let Ok(msg) = event_channel.try_recv() {
 				match msg {
@@ -44,7 +53,12 @@ pub fn setup(event_channel: Receiver<AudioMsg>) {
 						matrix.set_param(color_mix_g_gain, g.into());
 						matrix.set_param(color_mix_b_gain, b.into());
 					}
+					AudioMsg::Fusion => {
+						matrix.set_param(fusion_ad_trig, (1.0).into());
+						matrix.set_param(fusion_ad2_trig, (1.0).into());
+					}
 					AudioMsg::Jump => matrix.set_param(jump_ad_trig, (1.0).into()),
+					AudioMsg::Switch => matrix.set_param(switch_ad_trig, (1.0).into()),
 				}
 			}
 		}
diff --git a/src/filters.rs b/src/filters.rs
new file mode 100644
index 0000000..9a18af2
--- /dev/null
+++ b/src/filters.rs
@@ -0,0 +1,99 @@
+use crate::game::Level;
+
+use bevy::prelude::{shape::Quad, *};
+use bevy_rapier2d::prelude::*;
+
+#[derive(Component)]
+pub enum PassThroughFilter {
+	/// Absorbs this color (ignoring alpha)
+	Absorbing(Color),
+	/// Rotates hue by this angle (in degrees)
+	Rotating(f32),
+}
+
+impl PassThroughFilter {
+	pub fn apply(&self, color: Color) -> Color {
+		match self {
+			PassThroughFilter::Absorbing(filter_color) => Vec4::from(color)
+				.mul_add(
+					-Vec4::from(*filter_color) * Vec4::from([1., 1., 1., 0.]),
+					Vec4::from(color),
+				)
+				.into(),
+			PassThroughFilter::Rotating(filter_angle) => {
+				let mut hsla = color.as_hsla_f32();
+				hsla[0] = (hsla[0] + filter_angle) % 360.;
+				Color::hsla(hsla[0], hsla[1], hsla[2], hsla[3])
+			}
+		}
+	}
+}
+
+#[derive(Bundle)]
+pub struct AbsorbingFilter {
+	#[bundle]
+	pub mesh: ColorMesh2dBundle,
+	pub collider: Collider,
+	pub sensor: Sensor,
+	pub filter: PassThroughFilter,
+}
+
+pub fn spawn_absorbing_filter(
+	commands: &mut Commands,
+	meshes: &mut ResMut<Assets<Mesh>>,
+	materials: &mut ResMut<Assets<ColorMaterial>>,
+
+	transform: Transform,
+	size: Vec2,
+	color: Color,
+) {
+	let mut material_color = color;
+	material_color.set_a(0.5);
+	commands
+		.spawn_bundle(AbsorbingFilter {
+			mesh: ColorMesh2dBundle {
+				mesh: meshes.add(Mesh::from(Quad { size, flip: false })).into(),
+				material: materials.add(material_color.into()),
+				transform,
+				..Default::default()
+			},
+			collider: Collider::cuboid(size.x / 2., size.y / 2.),
+			sensor: Sensor,
+			filter: PassThroughFilter::Absorbing(color),
+		})
+		.insert(Level);
+}
+
+#[derive(Bundle)]
+pub struct RotatingFilter {
+	#[bundle]
+	pub sprite: SpriteBundle,
+	pub collider: Collider,
+	pub sensor: Sensor,
+	pub filter: PassThroughFilter,
+	pub velocity: Velocity,
+	pub rigid_body: RigidBody,
+}
+
+pub fn spawn_rotating_filter(
+	commands: &mut Commands,
+	asset_server: &Res<AssetServer>,
+
+	transform: Transform,
+	angle: f32,
+) {
+	commands
+		.spawn_bundle(RotatingFilter {
+			sprite: SpriteBundle {
+				texture: asset_server.get_handle("bevy.png"),
+				transform,
+				..Default::default()
+			},
+			collider: Collider::ball(32.),
+			sensor: Sensor,
+			filter: PassThroughFilter::Rotating(angle),
+			velocity: Velocity::angular(1.),
+			rigid_body: RigidBody::KinematicVelocityBased,
+		})
+		.insert(Level);
+}
diff --git a/src/game.rs b/src/game.rs
index b9ca210..eba3d44 100644
--- a/src/game.rs
+++ b/src/game.rs
@@ -1,20 +1,28 @@
 #![allow(clippy::precedence)]
 #![allow(clippy::too_many_arguments)]
 
+pub use crate::filters::*;
+
 use crate::AppState;
 
 use bevy::{
+	ecs::system::EntityCommands,
 	input::{keyboard::KeyCode, Input},
 	prelude::{shape::Quad, *},
-	sprite::Mesh2dHandle, ecs::system::EntityCommands,
+	sprite::Mesh2dHandle,
 };
 use bevy_rapier2d::prelude::*;
+use rapier2d::geometry::CollisionEventFlags;
 
 pub enum AudioMsg {
 	Color([f32; 3]),
+	Fusion,
 	Jump,
+	Switch,
 }
 
+pub struct FirstLevel(pub LevelId);
+
 #[derive(Clone, Copy, Eq, Hash, PartialEq)]
 pub struct LevelId(pub u32);
 
@@ -35,12 +43,14 @@ impl Plugin for GamePlugin {
 					.with_system(crate::levels::post_setup_level)
 					.with_system(change_character_system)
 					.with_system(player_movement_system)
+					.with_system(level_keyboard_system)
 					.with_system(move_camera)
 					.with_system(character_particle_effect_system),
-				)
-				.add_system_set(
-					SystemSet::on_update(AppState::Win)
+			)
+			.add_system_set(
+				SystemSet::on_update(AppState::Win)
 					.with_system(player_movement_system)
+					.with_system(level_keyboard_system)
 					.with_system(move_camera)
 					.with_system(character_particle_effect_system),
 			)
@@ -50,7 +60,7 @@ impl Plugin for GamePlugin {
 
 // Events
 
-pub struct LevelStartupEvent(pub Entity);
+pub struct LevelStartupEvent;
 
 // Resources
 
@@ -85,52 +95,41 @@ pub struct CharacterColor(pub Color);
 #[derive(Component)]
 pub struct Player;
 
+#[derive(Component)]
+pub struct CollisionCount(usize);
+
 // Systems
 
 fn setup(
-	mut commands: Commands,
+	first_level: Res<FirstLevel>,
 	mut current_level: ResMut<CurrentLevel>,
 	mut level_startup_event: EventWriter<LevelStartupEvent>,
 	mut camera_query: Query<&mut Transform, With<Camera>>,
 ) {
-	let level_id = LevelId(current_level.0.map_or(0, |level_id| level_id.0 + 1));
-	crate::levels::setup_level(
-		&mut commands,
-		&mut current_level,
-		&mut level_startup_event,
-		&mut camera_query,
-		level_id,
-	);
+	if current_level.0.is_none() {
+		current_level.0 = Some(first_level.0);
+	}
+
+	crate::levels::setup_level(&mut level_startup_event, &mut camera_query);
 }
 
-pub fn spawn_characters(
+pub fn spawn_characters<I: IntoIterator<Item = (Transform, Color)>>(
 	commands: &mut Commands,
 	character_meshes: &Res<CharacterMeshes>,
 	materials: &mut ResMut<Assets<ColorMaterial>>,
 	audio: &Res<crossbeam_channel::Sender<AudioMsg>>,
 
-	transforms: &mut Vec<Transform>,
-	colors: &Vec<Color>,
+	characters: I,
 ) {
-	spawn_character(
-		commands,
-		character_meshes,
-		materials,
-		audio,
-		transforms[0],
-		colors[0],
-		true,
-	);
-
-	for c in 1 .. transforms.len() {
+	for (i, (transform, color)) in characters.into_iter().enumerate() {
 		spawn_character(
 			commands,
 			character_meshes,
 			materials,
 			audio,
-			transforms[c],
-			colors[c],
-			false,
+			transform,
+			color,
+			i == 0,
 		);
 	}
 }
@@ -160,7 +159,6 @@ pub fn spawn_character(
 		.insert(CharacterColor(color))
 		.insert(RigidBody::Dynamic)
 		.insert(Collider::cuboid(32., 32.))
-		.insert(ExternalForce::default())
 		.insert(Velocity::default())
 		.insert(GravityScale(10.0))
 		.insert(LockedAxes::ROTATION_LOCKED)
@@ -169,8 +167,16 @@ pub fn spawn_character(
 			linear_damping: 0.5,
 			angular_damping: 0.5,
 		})
-		.insert(ExternalImpulse::default())
-		.insert(ActiveEvents::COLLISION_EVENTS);
+		.insert(ActiveEvents::COLLISION_EVENTS)
+		.with_children(|c| {
+			c.spawn_bundle(TransformBundle::from_transform(Transform::from_xyz(
+				0., -33., 0.,
+			)))
+			.insert(Sensor)
+			.insert(Collider::cuboid(30., 0.5))
+			.insert(ActiveEvents::COLLISION_EVENTS)
+			.insert(CollisionCount(0));
+		});
 
 	if is_player {
 		entity_commands.insert(Player);
@@ -180,58 +186,157 @@ pub fn spawn_character(
 	}
 }
 
+pub fn spawn_platforms<I: IntoIterator<Item = (Transform, Vec2)>>(
+	commands: &mut Commands,
+	meshes: &mut ResMut<Assets<Mesh>>,
+	materials: &mut ResMut<Assets<ColorMaterial>>,
+
+	platforms: I,
+) {
+	for (transform, size) in platforms.into_iter() {
+		spawn_platform(commands, meshes, materials, transform, size);
+	}
+}
+
+pub fn spawn_platform(
+	commands: &mut Commands,
+	meshes: &mut ResMut<Assets<Mesh>>,
+	materials: &mut ResMut<Assets<ColorMaterial>>,
+
+	transform: Transform,
+	size: Vec2,
+) {
+	commands
+		.spawn_bundle(ColorMesh2dBundle {
+			mesh: meshes.add(Mesh::from(Quad { size, flip: false })).into(),
+			material: materials.add(ColorMaterial::from(Color::GRAY)),
+			transform,
+			..default()
+		})
+		.insert(Collider::cuboid(size.x / 2., size.y / 2.))
+		.insert(Level);
+}
+
 fn collision_event_system(
 	mut commands: Commands,
 	character_meshes: Res<CharacterMeshes>,
 	mut materials: ResMut<Assets<ColorMaterial>>,
 	mut collision_events: EventReader<CollisionEvent>,
-	character_query: Query<(&CharacterColor, &Transform, Option<&Player>)>,
+	mut character_query: Query<(
+		&mut CharacterColor,
+		&Transform,
+		&mut Handle<ColorMaterial>,
+		Option<&Player>,
+	)>,
+	pass_through_filter_query: Query<&PassThroughFilter>,
+	mut collision_counter_query: Query<&mut CollisionCount>,
 	mut app_state: ResMut<State<AppState>>,
 	audio: Res<crossbeam_channel::Sender<AudioMsg>>,
 ) {
 	for collision_event in collision_events.iter() {
-		if let CollisionEvent::Started(e1, e2, flags) = collision_event {
-			if flags.is_empty() {
-				if let (
-					Ok((c1_color, c1_transform, c1_player)),
-					Ok((c2_color, c2_transform, c2_player))) =
-					(character_query.get(*e1), character_query.get(*e2))
-				{
-					// TODO completely remove particles
-					commands.entity(*e1).despawn_recursive();
-					commands.entity(*e2).despawn_recursive();
-
-					let new_color = (Vec4::from(c1_color.0) + Vec4::from(c2_color.0))
-						.clamp(Vec4::ZERO, Vec4::ONE);
-
-					// If color approximately white
-					if app_state.current() == &AppState::Game
-						&& 4. - new_color.length_squared() < 0.1
+		match collision_event {
+			CollisionEvent::Started(e1, e2, flags) => {
+				if flags.is_empty() {
+					if let (
+						Ok((c1_color, c1_transform, _c1_material, c1_player)),
+						Ok((c2_color, c2_transform, _c2_material, c2_player)),
+					) = (character_query.get(*e1), character_query.get(*e2))
 					{
-						app_state.replace(AppState::Win).ok();
-					}
+						commands.entity(*e1).despawn_recursive();
+						commands.entity(*e2).despawn_recursive();
 
-					// position character based on current player location
-					if let Some(_player) = c1_player {
+						let new_color = (Vec4::from(c1_color.0) + Vec4::from(c2_color.0))
+							.clamp(Vec4::ZERO, Vec4::ONE);
+
+						// If color approximately white
+						if app_state.current() == &AppState::Game
+							&& 4. - new_color.length_squared() < 0.1
+						{
+							app_state.replace(AppState::Win).ok();
+						}
+
+						// position character based on current player location
 						spawn_character(
 							&mut commands,
 							&character_meshes,
 							&mut materials,
 							&audio,
-							*c1_transform,
+							if c1_player.is_some() {
+								*c1_transform
+							} else if c2_player.is_some() {
+								*c2_transform
+							} else {
+								Transform::identity().with_translation(
+									(c1_transform.translation + c2_transform.translation) / 2.,
+								)
+							},
 							new_color.into(),
-							true,
-						);
-					} else if let Some(_player) = c2_player {
-						spawn_character(
-							&mut commands,
-							&character_meshes,
-							&mut materials,
-							&audio,
-							*c2_transform,
-							new_color.into(),
-							true,
+							c1_player.is_some() || c2_player.is_some(),
 						);
+
+						audio.send(AudioMsg::Fusion).ok();
+					}
+				} else if *flags == CollisionEventFlags::SENSOR {
+					if let (Ok((mut c_color, _c_transform, mut c_material, c_player)), Ok(filter)) = (
+						character_query.get_mut(*e1),
+						pass_through_filter_query.get(*e2),
+					) {
+						c_color.0 = filter.apply(c_color.0);
+						*c_material = materials.add(ColorMaterial::from(c_color.0));
+
+						if c_player.is_some() {
+							audio
+								.send(AudioMsg::Color([
+									c_color.0.r(),
+									c_color.0.g(),
+									c_color.0.b(),
+								]))
+								.ok();
+						}
+					} else if let (
+						Ok((mut c_color, _c_transform, mut c_material, c_player)),
+						Ok(filter),
+					) = (
+						character_query.get_mut(*e2),
+						pass_through_filter_query.get(*e1),
+					) {
+						c_color.0 = filter.apply(c_color.0);
+						*c_material = materials.add(ColorMaterial::from(c_color.0));
+
+						if c_player.is_some() {
+							audio
+								.send(AudioMsg::Color([
+									c_color.0.r(),
+									c_color.0.g(),
+									c_color.0.b(),
+								]))
+								.ok();
+						}
+					} else if let (Ok(mut collision_count), Err(_)) = (
+						collision_counter_query.get_mut(*e1),
+						character_query.get_mut(*e2),
+					) {
+						collision_count.0 += 1;
+					} else if let (Ok(mut collision_count), Err(_)) = (
+						collision_counter_query.get_mut(*e2),
+						character_query.get_mut(*e1),
+					) {
+						collision_count.0 += 1;
+					}
+				}
+			}
+			CollisionEvent::Stopped(e1, e2, flags) => {
+				if *flags == CollisionEventFlags::SENSOR {
+					if let (Ok(mut collision_count), Err(_)) = (
+						collision_counter_query.get_mut(*e1),
+						character_query.get_mut(*e2),
+					) {
+						collision_count.0 = collision_count.0.saturating_sub(1);
+					} else if let (Ok(mut collision_count), Err(_)) = (
+						collision_counter_query.get_mut(*e2),
+						character_query.get_mut(*e1),
+					) {
+						collision_count.0 = collision_count.0.saturating_sub(1);
 					}
 				}
 			}
@@ -246,14 +351,16 @@ fn change_character_system(
 	characters: Query<(Entity, &CharacterColor, Option<&Player>)>,
 	audio: Res<crossbeam_channel::Sender<AudioMsg>>,
 ) {
-	if !keyboard_input.just_pressed(KeyCode::Tab) { return; }
+	if !keyboard_input.just_pressed(KeyCode::Tab) {
+		return;
+	}
 
-    let mut player_idx: usize = 0;
-    let mut player_count: usize = 0;
+	let mut player_idx: usize = 0;
+	let mut player_count: usize = 0;
 
 	// find player idx
 	for (_entity, _color, player) in characters.iter() {
-		if let Some(_player) = player {
+		if player.is_some() {
 			player_idx = player_count;
 		}
 		player_count += 1;
@@ -274,7 +381,7 @@ fn change_character_system(
 			audio
 				.send(AudioMsg::Color([color.0.r(), color.0.g(), color.0.b()]))
 				.ok();
-            audio.send(AudioMsg::Jump).ok();
+			audio.send(AudioMsg::Switch).ok();
 		}
 
 		player_count += 1;
@@ -283,53 +390,69 @@ fn change_character_system(
 
 fn player_movement_system(
 	keyboard_input: Res<Input<KeyCode>>,
-	mut characters: Query<&mut Velocity, With<Player>>,
-	mut app_state: ResMut<State<AppState>>,
+	mut characters: Query<(&mut Velocity, &Children), With<Player>>,
+	collision_counter_query: Query<&CollisionCount>,
 	audio: Res<crossbeam_channel::Sender<AudioMsg>>,
 ) {
+	let right_pressed: bool =
+		keyboard_input.pressed(KeyCode::Right) || keyboard_input.pressed(KeyCode::D);
+	let left_pressed: bool =
+		keyboard_input.pressed(KeyCode::Left) || keyboard_input.pressed(KeyCode::A);
 
-    let right_pressed: bool =
-        keyboard_input.pressed(KeyCode::Right) || keyboard_input.pressed(KeyCode::D);
-    let left_pressed: bool =
-        keyboard_input.pressed(KeyCode::Left) || keyboard_input.pressed(KeyCode::A);
+	for (mut velocity, children) in characters.iter_mut() {
+		velocity.linvel.x = 200. * (right_pressed as i8 - left_pressed as i8) as f32;
 
-    for mut velocity  in characters.iter_mut() {
-        velocity.linvel.x = 200. * (right_pressed as i8 - left_pressed as i8) as f32;
-
-        if keyboard_input.just_pressed(KeyCode::Space) {
-            audio.send(AudioMsg::Jump).ok();
-            velocity.linvel.y = 500.;
-        }
-    }
-
-	if app_state.current() == &AppState::Win && keyboard_input.just_pressed(KeyCode::Return) {
-		app_state.replace(AppState::Game).unwrap();
+		if keyboard_input.just_pressed(KeyCode::Space)
+			&& collision_counter_query.get(children[0]).unwrap().0 != 0
+		{
+			audio.send(AudioMsg::Jump).ok();
+			velocity.linvel.y = 700.;
+		}
 	}
 }
 
 fn character_particle_effect_system(
-	characters: Query<(&Transform, &CharacterColor), With<Player>>,
+	player_character: Query<(&Transform, &CharacterColor), With<Player>>,
 	mut particle_effect: ResMut<crate::particle_effect::ParticleEffectResource>,
 ) {
-	for (transform, color) in characters.iter() {
+	if let Ok((transform, color)) = player_character.get_single() {
 		particle_effect.translation = transform.translation;
 		particle_effect.color = color.0;
 	}
 }
 
-fn win_setup(mut commands: Commands, asset_server: Res<AssetServer>) {
+fn win_setup(
+	mut commands: Commands,
+	mut meshes: ResMut<Assets<Mesh>>,
+	mut materials: ResMut<Assets<ColorMaterial>>,
+	asset_server: Res<AssetServer>,
+) {
 	let font = asset_server.get_handle("UacariLegacy-Thin.ttf");
+	commands
+		.spawn_bundle(ColorMesh2dBundle {
+			mesh: meshes
+				.add(Mesh::from(Quad {
+					size: Vec2 { x: 512., y: 64. },
+					flip: false,
+				}))
+				.into(),
+			material: materials.add(ColorMaterial::from(Color::rgba(0., 0., 0., 0.9))),
+			transform: Transform::from_xyz(0., 0., 3.),
+			..default()
+		})
+		.insert(Level);
 	commands
 		.spawn_bundle(Text2dBundle {
 			text: Text::from_section(
 				"Press ENTER to level up",
 				TextStyle {
 					font,
-					font_size: 32.0,
+					font_size: 36.0,
 					color: Color::WHITE,
 				},
 			)
 			.with_alignment(TextAlignment::CENTER),
+			transform: Transform::from_xyz(0., 0., 4.),
 			..Default::default()
 		})
 		.insert(Level);
@@ -344,18 +467,44 @@ fn move_camera(
 	const FOLLOW_SPEED: f32 = std::f32::consts::PI;
 
 	for character_transform in characters.iter() {
-		let (camera, mut camera_transform) =
-			camera_query.single_mut();
+		let (camera, mut camera_transform) = camera_query.single_mut();
 
 		let size: Vec2 = camera.logical_viewport_size().unwrap();
 		let half_height: f32 = size.y * 0.5;
 		camera_transform.translation = camera_transform.translation.lerp(
-			character_transform.translation, time.delta_seconds() * FOLLOW_SPEED
+			character_transform.translation,
+			time.delta_seconds() * FOLLOW_SPEED,
 		);
 
 		// prevent camera from going too low
-		camera_transform.translation.y = camera_transform.translation.y.max(half_height-MARGIN);
+		camera_transform.translation.y = camera_transform.translation.y.max(half_height - MARGIN);
 		// always make sure that camera is away from the object in order to render them
 		camera_transform.translation.z = 999.0;
 	}
 }
+
+fn level_keyboard_system(
+	mut commands: Commands,
+	mut current_level: ResMut<CurrentLevel>,
+	mut level_startup_event: EventWriter<LevelStartupEvent>,
+	mut camera_query: Query<&mut Transform, With<Camera>>,
+	keyboard_input: Res<Input<KeyCode>>,
+	level_query: Query<Entity, With<Level>>,
+	mut app_state: ResMut<State<AppState>>,
+) {
+	if app_state.current() == &AppState::Win && keyboard_input.just_pressed(KeyCode::Return) {
+		current_level.0 = Some(LevelId(
+			current_level.0.map_or(0, |level_id| level_id.0 + 1),
+		));
+		app_state.replace(AppState::Game).unwrap();
+	}
+
+	if keyboard_input.just_pressed(KeyCode::R) {
+		for entity in level_query.iter() {
+			commands.entity(entity).despawn_recursive();
+		}
+		if app_state.replace(AppState::Game).is_err() {
+			crate::levels::setup_level(&mut level_startup_event, &mut camera_query);
+		}
+	}
+}
diff --git a/src/levels.rs b/src/levels.rs
index fbe3ff8..c131e63 100644
--- a/src/levels.rs
+++ b/src/levels.rs
@@ -1,29 +1,17 @@
 #![allow(clippy::too_many_arguments)]
 
-mod game_over;
-mod level0;
-mod level1;
-
 use crate::game::*;
 
-use bevy::prelude::*;
+use bevy::{prelude::*, reflect::TypeUuid};
+use serde::{Deserialize, Serialize};
 
 pub fn setup_level(
-	commands: &mut Commands,
-	current_level: &mut ResMut<CurrentLevel>,
 	level_startup_event: &mut EventWriter<LevelStartupEvent>,
 	camera_query: &mut Query<&mut Transform, With<Camera>>,
-	level_id: LevelId,
 ) {
-	let level_entity = commands
-		.spawn()
-		.insert(Level)
-		.id();
-	current_level.0 = Some(level_id);
-
 	camera_query.single_mut().translation = Default::default();
 
-	level_startup_event.send(LevelStartupEvent(level_entity));
+	level_startup_event.send(LevelStartupEvent);
 }
 
 pub fn despawn_level(mut commands: Commands, level_query: Query<Entity, With<Level>>) {
@@ -36,29 +24,158 @@ pub fn despawn_level(mut commands: Commands, level_query: Query<Entity, With<Lev
 pub fn post_setup_level(
 	mut commands: Commands,
 	character_meshes: Res<CharacterMeshes>,
+	mut meshes: ResMut<Assets<Mesh>>,
 	mut materials: ResMut<Assets<ColorMaterial>>,
 	current_level: Res<CurrentLevel>,
 	mut level_startup_event: EventReader<LevelStartupEvent>,
 	asset_server: Res<AssetServer>,
 	audio: Res<crossbeam_channel::Sender<AudioMsg>>,
+	stored_levels_assets: Res<Assets<StoredLevels>>,
+	stored_levels_handle: Res<Handle<StoredLevels>>,
 ) {
-	for LevelStartupEvent(level_entity) in level_startup_event.iter() {
+	for _ in level_startup_event.iter() {
 		if let Some(level_id) = current_level.0 {
-			match level_id.0 {
-				0 => level0::setup(
+			if let Some(stored_level) = stored_levels_assets
+				.get(&stored_levels_handle)
+				.unwrap()
+				.levels
+				.get(level_id.0 as usize)
+			{
+				spawn_stored_level(
 					&mut commands,
 					&character_meshes,
+					&mut meshes,
 					&mut materials,
+					&asset_server,
 					&audio,
-				),
-				1 => level1::setup(
-					&mut commands,
-					&character_meshes,
-					&mut materials,
-					&audio,
-				),
-				_ => game_over::setup(&mut commands, &asset_server),
+					stored_level,
+				);
 			}
 		}
 	}
 }
+
+#[derive(Deserialize, Serialize, TypeUuid)]
+#[uuid = "1fbba930-644b-0d62-2514-4b302b945327"]
+pub struct StoredLevels {
+	levels: Vec<StoredLevel>,
+}
+
+#[derive(Deserialize, Serialize, TypeUuid)]
+#[uuid = "a1464a30-1f57-a654-d56c-ded41032af0b"]
+pub struct StoredLevel {
+	pub comment: String,
+	pub characters: Vec<StoredCharacter>,
+	pub platforms: Vec<StoredPlatform>,
+	pub absorbing_filters: Vec<StoredAbsorbingFilter>,
+	pub rotating_filters: Vec<StoredRotatingFilter>,
+	pub texts: Vec<StoredText>,
+}
+
+#[derive(Deserialize, Serialize, TypeUuid)]
+#[uuid = "1c798f8c-ef15-c528-693e-76becdef6b10"]
+pub struct StoredCharacter {
+	pub pos: Vec2,
+	pub color: Vec4,
+}
+
+#[derive(Deserialize, Serialize, TypeUuid)]
+#[uuid = "31696095-59de-93be-b5e9-333c2afbc900"]
+pub struct StoredPlatform {
+	pub pos: Vec2,
+	pub size: Vec2,
+}
+
+#[derive(Deserialize, Serialize, TypeUuid)]
+#[uuid = "bcad7fff-0605-c4e3-3cd4-42d5bbaad926"]
+pub struct StoredAbsorbingFilter {
+	pub pos: Vec2,
+	pub size: Vec2,
+	pub color: Vec4,
+}
+
+#[derive(Deserialize, Serialize, TypeUuid)]
+#[uuid = "fa2843f2-6e34-601b-6c46-4827b0370b3f"]
+pub struct StoredRotatingFilter {
+	pub pos: Vec2,
+	pub angle: f32,
+}
+
+#[derive(Deserialize, Serialize, TypeUuid)]
+#[uuid = "72f6321a-f01f-6eea-9b17-3159837a2fd3"]
+pub struct StoredText {
+	pub pos: Vec2,
+	pub font_size: f32,
+	pub text: String,
+}
+
+pub fn spawn_stored_level(
+	commands: &mut Commands,
+	character_meshes: &Res<CharacterMeshes>,
+	meshes: &mut ResMut<Assets<Mesh>>,
+	materials: &mut ResMut<Assets<ColorMaterial>>,
+	asset_server: &Res<AssetServer>,
+	audio: &Res<crossbeam_channel::Sender<AudioMsg>>,
+
+	stored_level: &StoredLevel,
+) {
+	let font = asset_server.get_handle("UacariLegacy-Thin.ttf");
+	spawn_platforms(
+		commands,
+		meshes,
+		materials,
+		stored_level.platforms.iter().map(|platform| {
+			(
+				Transform::from_xyz(platform.pos.x, platform.pos.y, 0.),
+				platform.size,
+			)
+		}),
+	);
+	spawn_characters(
+		commands,
+		character_meshes,
+		materials,
+		audio,
+		stored_level.characters.iter().map(|character| {
+			(
+				Transform::from_xyz(character.pos.x, character.pos.y, 0.),
+				character.color.into(),
+			)
+		}),
+	);
+	for absorbing_filter in stored_level.absorbing_filters.iter() {
+		spawn_absorbing_filter(
+			commands,
+			meshes,
+			materials,
+			Transform::from_xyz(absorbing_filter.pos.x, absorbing_filter.pos.y, 2.),
+			absorbing_filter.size,
+			absorbing_filter.color.into(),
+		);
+	}
+	for rotating_filter in stored_level.rotating_filters.iter() {
+		spawn_rotating_filter(
+			commands,
+			asset_server,
+			Transform::from_xyz(rotating_filter.pos.x, rotating_filter.pos.y, 2.),
+			rotating_filter.angle,
+		);
+	}
+	for text in stored_level.texts.iter() {
+		commands
+			.spawn_bundle(Text2dBundle {
+				text: Text::from_section(
+					&text.text,
+					TextStyle {
+						font: font.clone(),
+						font_size: text.font_size,
+						color: Color::WHITE,
+					},
+				)
+				.with_alignment(TextAlignment::CENTER),
+				transform: Transform::from_xyz(text.pos.x, text.pos.y, 0.),
+				..Default::default()
+			})
+			.insert(Level);
+	}
+}
diff --git a/src/levels/game_over.rs b/src/levels/game_over.rs
deleted file mode 100644
index f03026d..0000000
--- a/src/levels/game_over.rs
+++ /dev/null
@@ -1,36 +0,0 @@
-use crate::game::*;
-
-use bevy::prelude::*;
-
-pub fn setup(commands: &mut Commands, asset_server: &Res<AssetServer>) {
-	let font = asset_server.get_handle("UacariLegacy-Thin.ttf");
-	commands
-		.spawn_bundle(Text2dBundle {
-			text: Text::from_section(
-				"GAME OVER",
-				TextStyle {
-					font: font.clone(),
-					font_size: 48.0,
-					color: Color::WHITE,
-				},
-			)
-			.with_alignment(TextAlignment::CENTER),
-			transform: Transform::from_xyz(0., 128.0, 0.),
-			..Default::default()
-		})
-		.insert(Level);
-	commands
-		.spawn_bundle(Text2dBundle {
-			text: Text::from_section(
-				"There is no more light to combine.",
-				TextStyle {
-					font,
-					font_size: 32.0,
-					color: Color::WHITE,
-				},
-			)
-			.with_alignment(TextAlignment::CENTER),
-			..Default::default()
-		})
-		.insert(Level);
-}
diff --git a/src/levels/level0.rs b/src/levels/level0.rs
deleted file mode 100644
index 01b13a4..0000000
--- a/src/levels/level0.rs
+++ /dev/null
@@ -1,46 +0,0 @@
-use crate::game::*;
-
-use bevy::prelude::*;
-use bevy_rapier2d::prelude::*;
-
-pub fn setup(
-	commands: &mut Commands,
-	character_meshes: &Res<CharacterMeshes>,
-	materials: &mut ResMut<Assets<ColorMaterial>>,
-	// selected_character_id: &mut Mut<SelectedCharacterId>,
-	// character_id_list: &mut Mut<CharacterIdList>,
-	audio: &Res<crossbeam_channel::Sender<AudioMsg>>,
-) {
-	commands
-		.spawn_bundle(TransformBundle::from(Transform::from_xyz(0.0, -256.0, 0.0)))
-		.insert(Collider::cuboid(400., 10.))
-		.insert(Level);
-
-	spawn_character(
-		commands,
-		character_meshes,
-		materials,
-		audio,
-		Transform::from_xyz(-128., -64., 0.),
-		Color::RED,
-        true,
-	);
-	spawn_character(
-		commands,
-		character_meshes,
-		materials,
-		audio,
-		Transform::from_xyz(0., -64., 0.),
-		Color::GREEN,
-		false,
-	);
-	spawn_character(
-		commands,
-		character_meshes,
-		materials,
-		audio,
-		Transform::from_xyz(128., -64., 0.),
-		Color::BLUE,
-		false,
-	);
-}
diff --git a/src/levels/level1.rs b/src/levels/level1.rs
deleted file mode 100644
index 3efdebf..0000000
--- a/src/levels/level1.rs
+++ /dev/null
@@ -1,50 +0,0 @@
-use crate::game::*;
-
-use bevy::prelude::*;
-use bevy_rapier2d::prelude::*;
-
-pub fn setup(
-	commands: &mut Commands,
-	character_meshes: &Res<CharacterMeshes>,
-	materials: &mut ResMut<Assets<ColorMaterial>>,
-	audio: &Res<crossbeam_channel::Sender<AudioMsg>>,
-) {
-	commands
-		.spawn_bundle(TransformBundle::from(Transform::from_xyz(0.0, -256.0, 0.0)))
-		.insert(Collider::cuboid(400., 10.))
-		.insert(Level);
-	commands
-		.spawn_bundle(TransformBundle::from(Transform::from_xyz(
-			256.0, -128.0, 0.0,
-		)))
-		.insert(Collider::cuboid(200., 10.))
-		.insert(Level);
-
-	spawn_character(
-		commands,
-		character_meshes,
-		materials,
-		audio,
-		Transform::from_xyz(128., 64., 0.),
-		Color::BLUE,
-        true,
-	);
-	spawn_character(
-		commands,
-		character_meshes,
-		materials,
-		audio,
-		Transform::from_xyz(-128., -128., 0.),
-		Color::RED,
-		false,
-	);
-	spawn_character(
-		commands,
-		character_meshes,
-		materials,
-		audio,
-		Transform::from_xyz(0., -128., 0.),
-		Color::GREEN,
-		false,
-	);
-}
diff --git a/src/main.rs b/src/main.rs
index 7a19dab..410492a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,11 +1,16 @@
 #[cfg(not(target_arch = "wasm32"))]
 mod audio;
+mod filters;
 mod game;
 mod levels;
 mod menu;
 mod particle_effect;
 
-use bevy::{core_pipeline::clear_color::ClearColorConfig, prelude::*};
+use bevy::{
+	prelude::*,
+	window::{WindowId, WindowMode},
+};
+use bevy_common_assets::json::JsonAssetPlugin;
 use bevy_rapier2d::prelude::*;
 
 #[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
@@ -22,35 +27,66 @@ fn main() {
 	#[cfg(not(target_arch = "wasm32"))]
 	std::thread::spawn(move || audio::setup(audio_event_receiver));
 
+	#[cfg(not(target_arch = "wasm32"))]
+	let first_level = game::LevelId(
+		std::env::args()
+			.nth(1)
+			.map_or(0, |s| s.parse().unwrap_or(0)),
+	);
+	#[cfg(target_arch = "wasm32")]
+	let first_level = game::LevelId(0);
+
 	App::new()
+		.insert_resource(Msaa { samples: 4 })
 		.insert_resource(audio_event_sender)
 		.add_state(AppState::Menu)
+		.insert_resource(game::FirstLevel(first_level))
+		.insert_resource(ClearColor(Color::BLACK))
 		.add_plugins(DefaultPlugins)
+		.add_plugin(JsonAssetPlugin::<levels::StoredLevels>::new(&[
+			"levels.json",
+		]))
 		.add_plugin(RapierPhysicsPlugin::<NoUserData>::pixels_per_meter(64.0))
-		.add_plugin(RapierDebugRenderPlugin::default())
+		//.add_plugin(RapierDebugRenderPlugin::default())
 		.add_plugin(menu::MenuPlugin)
 		.add_plugin(game::GamePlugin)
 		.add_plugin(particle_effect::ParticleEffectPlugin)
-		.add_plugin(bevy_inspector_egui::WorldInspectorPlugin::new())
+		//.add_plugin(bevy_inspector_egui::WorldInspectorPlugin::new())
+		.add_system(keyboard_util_system)
 		.add_startup_system(setup)
 		.run();
 }
 
-fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
-	#[cfg(not(target_arch = "wasm32"))]
-	let font: Handle<Font> = asset_server.load("UacariLegacy-Thin.ttf");
-	#[cfg(target_arch = "wasm32")]
-	let font: Handle<Font> = asset_server.load("UacariLegacy-Thin.ttf");
-	commands.insert_resource(font);
+fn setup(mut commands: Commands, mut windows: ResMut<Windows>, asset_server: Res<AssetServer>) {
+	windows
+		.get_mut(WindowId::primary())
+		.unwrap()
+		.set_title(String::from("Bevyjam"));
 
-	commands.spawn_bundle(Camera2dBundle {
-		camera_2d: Camera2d {
-			clear_color: ClearColorConfig::Custom(Color::BLACK),
-		},
-		..Default::default()
-	});
+	commands.insert_resource(asset_server.load::<levels::StoredLevels, _>("game.levels.json"));
+	commands.insert_resource(asset_server.load::<Font, _>("UacariLegacy-Thin.ttf"));
+	commands.insert_resource(asset_server.load::<Image, _>("bevy.png"));
+
+	commands.spawn_bundle(Camera2dBundle::default());
 	commands.insert_resource(AmbientLight {
 		color: Color::WHITE,
 		brightness: 0.6,
 	});
 }
+
+fn keyboard_util_system(keyboard_input: Res<Input<KeyCode>>, mut windows: ResMut<Windows>) {
+	#[cfg(not(target_arch = "wasm32"))]
+	{
+		if keyboard_input.just_released(KeyCode::Escape) {
+			std::process::exit(0);
+		}
+		if keyboard_input.just_pressed(KeyCode::F11) {
+			if let Some(window) = windows.get_primary_mut() {
+				window.set_mode(match window.mode() {
+					WindowMode::Windowed => WindowMode::Fullscreen,
+					_ => WindowMode::Windowed,
+				});
+			}
+		}
+	}
+}
diff --git a/src/menu.rs b/src/menu.rs
index 52bcdb9..fff9778 100644
--- a/src/menu.rs
+++ b/src/menu.rs
@@ -26,7 +26,7 @@ fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
 				"BEVYJAM",
 				TextStyle {
 					font: font.clone(),
-					font_size: 48.0,
+					font_size: 96.0,
 					color: Color::WHITE,
 				},
 			)