diff --git a/README.md b/README.md
index e4a57f5..bb59e47 100644
--- a/README.md
+++ b/README.md
@@ -44,7 +44,7 @@ The synthetizer matrix can be edited using [HexoSynth](https://github.com/WeirdC
 
 ## License
 
-GNU AGPL v3, CopyLeft 2022 Pascal Engélibert
+GNU AGPL v3, CopyLeft 2022 Pascal Engélibert, Nixon Cheng
 
 This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, version 3 of the License.  
 This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.  
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/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..a4439c4
--- /dev/null
+++ b/src/filters.rs
@@ -0,0 +1,20 @@
+use bevy::prelude::*;
+use bevy_rapier2d::prelude::*;
+
+#[derive(Component, Default)]
+pub struct FilterColor(pub Color);
+
+#[derive(Component)]
+pub enum PassThroughFilter {
+	Absorbing,
+}
+
+#[derive(Bundle)]
+pub struct AbsorbingFilter {
+	pub color: FilterColor,
+	#[bundle]
+	pub mesh: ColorMesh2dBundle,
+	pub collider: Collider,
+	pub sensor: Sensor,
+	pub filter_type: PassThroughFilter,
+}
diff --git a/src/game.rs b/src/game.rs
index ef051cb..a265f88 100644
--- a/src/game.rs
+++ b/src/game.rs
@@ -1,19 +1,23 @@
 #![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,
 };
 use bevy_rapier2d::prelude::*;
-use std::collections::BTreeSet;
 
 pub enum AudioMsg {
 	Color([f32; 3]),
+	Fusion,
 	Jump,
+	Switch,
 }
 
 #[derive(Clone, Copy, Eq, Hash, PartialEq)]
@@ -34,13 +38,14 @@ impl Plugin for GamePlugin {
 			.add_system_set(
 				SystemSet::on_update(AppState::Game)
 					.with_system(crate::levels::post_setup_level)
-					.with_system(keyboard_input_system)
+					.with_system(change_character_system)
+					.with_system(player_movement_system)
 					.with_system(move_camera)
 					.with_system(character_particle_effect_system),
 			)
 			.add_system_set(
 				SystemSet::on_update(AppState::Win)
-					.with_system(keyboard_input_system)
+					.with_system(player_movement_system)
 					.with_system(move_camera)
 					.with_system(character_particle_effect_system),
 			)
@@ -79,18 +84,12 @@ impl FromWorld for CharacterMeshes {
 #[derive(Component)]
 pub struct Level;
 
-#[derive(Clone, Component, Copy, Eq, Hash, Ord, PartialEq, PartialOrd)]
-pub struct CharacterId(pub u32);
-
-#[derive(Clone, Component, Copy, Eq, Hash, PartialEq)]
-pub struct SelectedCharacterId(pub Option<CharacterId>);
-
-#[derive(Component)]
-pub struct CharacterIdList(pub BTreeSet<CharacterId>);
-
 #[derive(Clone, Component, PartialEq)]
 pub struct CharacterColor(pub Color);
 
+#[derive(Component)]
+pub struct Player;
+
 // Systems
 
 fn setup(
@@ -109,36 +108,49 @@ fn setup(
 	);
 }
 
+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>>,
+
+	characters: I,
+) {
+	for (i, (transform, color)) in characters.into_iter().enumerate() {
+		spawn_character(
+			commands,
+			character_meshes,
+			materials,
+			audio,
+			transform,
+			color,
+			i == 0,
+		);
+	}
+}
+
 pub fn spawn_character(
 	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>>,
 	mut transform: Transform,
 	color: Color,
+	is_player: bool,
 ) {
 	transform.translation.z = transform.translation.z.max(1.0);
 
-	let character_id = CharacterId(
-		character_id_list
-			.0
-			.iter()
-			.last()
-			.map_or(0, |last_character_id| last_character_id.0 + 1),
-	);
-	character_id_list.0.insert(character_id);
+	let color_mesh_2d_bundle: ColorMesh2dBundle = ColorMesh2dBundle {
+		mesh: character_meshes.square.clone(),
+		material: materials.add(ColorMaterial::from(color)),
+		transform,
+		..default()
+	};
 
-	commands
-		.spawn_bundle(ColorMesh2dBundle {
-			mesh: character_meshes.square.clone(),
-			material: materials.add(ColorMaterial::from(color)),
-			transform,
-			..default()
-		})
+	let mut entity_commands: EntityCommands = commands.spawn_bundle(color_mesh_2d_bundle);
+
+	entity_commands
 		.insert(Level)
-		.insert(character_id)
 		.insert(CharacterColor(color))
 		.insert(RigidBody::Dynamic)
 		.insert(Collider::cuboid(32., 32.))
@@ -154,9 +166,8 @@ pub fn spawn_character(
 		.insert(ExternalImpulse::default())
 		.insert(ActiveEvents::COLLISION_EVENTS);
 
-	// If no character is selected, then select this one
-	if selected_character_id.0.is_none() {
-		selected_character_id.0 = Some(character_id);
+	if is_player {
+		entity_commands.insert(Player);
 		audio
 			.send(AudioMsg::Color([color.r(), color.g(), color.b()]))
 			.ok();
@@ -168,24 +179,18 @@ fn collision_event_system(
 	character_meshes: Res<CharacterMeshes>,
 	mut materials: ResMut<Assets<ColorMaterial>>,
 	mut collision_events: EventReader<CollisionEvent>,
-	character_query: Query<(&CharacterId, &CharacterColor, &Transform)>,
-	mut level_query: Query<(&mut SelectedCharacterId, &mut CharacterIdList)>,
+	character_query: Query<(&CharacterColor, &Transform, Option<&Player>)>,
 	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_id, c1_color, c1_transform)), Ok((c2_id, c2_color, _c2_transform))) =
-					(character_query.get(*e1), character_query.get(*e2))
+				if let (
+					Ok((c1_color, c1_transform, c1_player)),
+					Ok((c2_color, c2_transform, c2_player)),
+				) = (character_query.get(*e1), character_query.get(*e2))
 				{
-					let (mut selected_character_id, mut character_id_list) =
-						level_query.single_mut();
-					character_id_list.0.remove(c1_id);
-					character_id_list.0.remove(c2_id);
-					selected_character_id.0 = None;
-
-					// TODO completely remove particles
 					commands.entity(*e1).despawn_recursive();
 					commands.entity(*e2).despawn_recursive();
 
@@ -199,70 +204,93 @@ fn collision_event_system(
 						app_state.replace(AppState::Win).ok();
 					}
 
+					// position character based on current player location
 					spawn_character(
 						&mut commands,
 						&character_meshes,
 						&mut materials,
-						&mut selected_character_id,
-						&mut character_id_list,
 						&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(),
+						c1_player.is_some() || c2_player.is_some(),
 					);
+
+					audio.send(AudioMsg::Fusion).ok();
 				}
 			}
 		}
 	}
 }
 
-fn keyboard_input_system(
+fn change_character_system(
+	mut commands: Commands,
+
 	keyboard_input: Res<Input<KeyCode>>,
-	mut characters: Query<(&CharacterId, &mut Velocity, &CharacterColor)>,
-	mut level_query: Query<(&mut SelectedCharacterId, &CharacterIdList)>,
+	characters: Query<(Entity, &CharacterColor, Option<&Player>)>,
+	audio: Res<crossbeam_channel::Sender<AudioMsg>>,
+) {
+	if !keyboard_input.just_pressed(KeyCode::Tab) {
+		return;
+	}
+
+	let mut player_idx: usize = 0;
+	let mut player_count: usize = 0;
+
+	// find player idx
+	for (_entity, _color, player) in characters.iter() {
+		if player.is_some() {
+			player_idx = player_count;
+		}
+		player_count += 1;
+	}
+
+	// calculate next player index
+	let next_player_idx = (player_idx + 1) % player_count;
+	player_count = 0;
+
+	// exchange `Player` component from old `player_idx` to new `next_player_idx`
+	for (entity, color, _player) in characters.iter() {
+		if player_count == player_idx {
+			commands.entity(entity).remove::<Player>();
+		}
+
+		if player_count == next_player_idx {
+			commands.entity(entity).insert(Player);
+			audio
+				.send(AudioMsg::Color([color.0.r(), color.0.g(), color.0.b()]))
+				.ok();
+			audio.send(AudioMsg::Switch).ok();
+		}
+
+		player_count += 1;
+	}
+}
+
+fn player_movement_system(
+	keyboard_input: Res<Input<KeyCode>>,
+	mut characters: Query<&mut Velocity, With<Player>>,
 	mut app_state: ResMut<State<AppState>>,
 	audio: Res<crossbeam_channel::Sender<AudioMsg>>,
 ) {
-	if let Ok((mut selected_character_id, character_id_list)) = level_query.get_single_mut() {
-		if keyboard_input.just_pressed(KeyCode::Tab) {
-			let selected = if let Some(selected_character_id) = &mut selected_character_id.0 {
-				*selected_character_id = *character_id_list
-					.0
-					.range(*selected_character_id..)
-					.nth(1)
-					.unwrap_or_else(|| character_id_list.0.iter().next().unwrap());
-				*selected_character_id
-			} else {
-				selected_character_id.0 = Some(CharacterId(0));
-				CharacterId(0)
-			};
+	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);
 
-			if let Some((_character_id, _velocity, color)) = characters
-				.iter_mut()
-				.find(|(character_id, _velocity, _color)| **character_id == selected)
-			{
-				audio
-					.send(AudioMsg::Color([color.0.r(), color.0.g(), color.0.b()]))
-					.ok();
-			}
-		}
+	for mut velocity in characters.iter_mut() {
+		velocity.linvel.x = 200. * (right_pressed as i8 - left_pressed as i8) as f32;
 
-		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);
-
-		if let Some(selected_character_id) = &selected_character_id.0 {
-			if let Some((_character_id, mut velocity, _color)) = characters
-				.iter_mut()
-				.find(|(character_id, _velocity, _color)| *character_id == selected_character_id)
-			{
-				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 keyboard_input.just_pressed(KeyCode::Space) {
+			audio.send(AudioMsg::Jump).ok();
+			velocity.linvel.y = 500.;
 		}
 	}
 
@@ -272,20 +300,12 @@ fn keyboard_input_system(
 }
 
 fn character_particle_effect_system(
-	mut characters: Query<(&CharacterId, &Transform, &CharacterColor)>,
+	characters: Query<(&Transform, &CharacterColor), With<Player>>,
 	mut particle_effect: ResMut<crate::particle_effect::ParticleEffectResource>,
-	mut level_query: Query<&SelectedCharacterId>,
 ) {
-	if let Ok(selected_character_id) = level_query.get_single_mut() {
-		if let Some(selected_character_id) = &selected_character_id.0 {
-			if let Some((_character_id, transform, color)) = characters
-				.iter_mut()
-				.find(|(character_id, _transform, _color)| *character_id == selected_character_id)
-			{
-				particle_effect.translation = transform.translation;
-				particle_effect.color = color.0;
-			}
-		}
+	for (transform, color) in characters.iter() {
+		particle_effect.translation = transform.translation;
+		particle_effect.color = color.0;
 	}
 }
 
@@ -309,29 +329,25 @@ fn win_setup(mut commands: Commands, asset_server: Res<AssetServer>) {
 
 fn move_camera(
 	mut camera_query: Query<(&Camera, &mut Transform)>,
-	characters: Query<(&CharacterId, &Transform), Without<Camera>>,
-	level_query: Query<&SelectedCharacterId>,
+	characters: Query<&Transform, (Without<Camera>, With<Player>)>,
 	time: Res<Time>,
 ) {
 	const MARGIN: f32 = 300.0;
 	const FOLLOW_SPEED: f32 = std::f32::consts::PI;
 
-	if let Ok(selected_character_id) = level_query.get_single() {
-		if let Some(selected_character_id) = &selected_character_id.0 {
-			if let Some((_character_id, transform)) = characters
-				.iter()
-				.find(|(character_id, _transform)| *character_id == selected_character_id)
-			{
-				let (camera, mut camera_transform) =
-					camera_query.single_mut();
+	for character_transform in characters.iter() {
+		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(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.z = 999.0;
-			}
-		}
+		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,
+		);
+
+		// prevent camera from going too low
+		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;
 	}
 }
diff --git a/src/levels.rs b/src/levels.rs
index b34c23f..a669d0f 100644
--- a/src/levels.rs
+++ b/src/levels.rs
@@ -7,7 +7,6 @@ mod level1;
 use crate::game::*;
 
 use bevy::prelude::*;
-use std::collections::BTreeSet;
 
 pub fn setup_level(
 	commands: &mut Commands,
@@ -16,12 +15,7 @@ pub fn setup_level(
 	camera_query: &mut Query<&mut Transform, With<Camera>>,
 	level_id: LevelId,
 ) {
-	let level_entity = commands
-		.spawn()
-		.insert(Level)
-		.insert(SelectedCharacterId(None))
-		.insert(CharacterIdList(BTreeSet::new()))
-		.id();
+	let level_entity = commands.spawn().insert(Level).id();
 	current_level.0 = Some(level_id);
 
 	camera_query.single_mut().translation = Default::default();
@@ -39,37 +33,31 @@ 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_query: Query<(&mut SelectedCharacterId, &mut CharacterIdList)>,
 	mut level_startup_event: EventReader<LevelStartupEvent>,
 	asset_server: Res<AssetServer>,
 	audio: Res<crossbeam_channel::Sender<AudioMsg>>,
 ) {
-	for LevelStartupEvent(level_entity) in level_startup_event.iter() {
-		if let Ok((mut selected_character_id, mut character_id_list)) =
-			level_query.get_mut(*level_entity)
-		{
-			if let Some(level_id) = current_level.0 {
-				match level_id.0 {
-					0 => level0::setup(
-						&mut commands,
-						&character_meshes,
-						&mut materials,
-						&mut selected_character_id,
-						&mut character_id_list,
-						&audio,
-					),
-					1 => level1::setup(
-						&mut commands,
-						&character_meshes,
-						&mut materials,
-						&mut selected_character_id,
-						&mut character_id_list,
-						&audio,
-					),
-					_ => game_over::setup(&mut commands, &asset_server),
-				}
+	for LevelStartupEvent(_level_entity) in level_startup_event.iter() {
+		if let Some(level_id) = current_level.0 {
+			match level_id.0 {
+				0 => level0::setup(
+					&mut commands,
+					&mut meshes,
+					&character_meshes,
+					&mut materials,
+					&audio,
+				),
+				1 => level1::setup(
+					&mut commands,
+					&mut meshes,
+					&character_meshes,
+					&mut materials,
+					&audio,
+				),
+				_ => game_over::setup(&mut commands, &asset_server),
 			}
 		}
 	}
diff --git a/src/levels/level0.rs b/src/levels/level0.rs
index e95849d..5b72da6 100644
--- a/src/levels/level0.rs
+++ b/src/levels/level0.rs
@@ -1,49 +1,39 @@
 use crate::game::*;
 
-use bevy::prelude::*;
+use bevy::prelude::{shape::Quad, *};
 use bevy_rapier2d::prelude::*;
 
 pub fn setup(
 	commands: &mut Commands,
+	meshes: &mut ResMut<Assets<Mesh>>,
 	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.))
+		.spawn_bundle(ColorMesh2dBundle {
+			mesh: meshes
+				.add(Mesh::from(Quad {
+					size: Vec2 { x: 800.0, y: 16.0 },
+					flip: false,
+				}))
+				.into(),
+			material: materials.add(ColorMaterial::from(Color::GRAY)),
+			transform: Transform::from_xyz(0.0, -256.0, 0.0),
+			..default()
+		})
+		.insert(Collider::cuboid(400., 8.))
 		.insert(Level);
 
-	spawn_character(
+	spawn_characters(
 		commands,
 		character_meshes,
 		materials,
-		selected_character_id,
-		character_id_list,
 		audio,
-		Transform::from_xyz(-128., -64., 0.),
-		Color::RED,
-	);
-	spawn_character(
-		commands,
-		character_meshes,
-		materials,
-		selected_character_id,
-		character_id_list,
-		audio,
-		Transform::from_xyz(0., -64., 0.),
-		Color::GREEN,
-	);
-	spawn_character(
-		commands,
-		character_meshes,
-		materials,
-		selected_character_id,
-		character_id_list,
-		audio,
-		Transform::from_xyz(128., -64., 0.),
-		Color::BLUE,
+		[
+			(Transform::from_xyz(-128., -64., 0.), Color::RED),
+			(Transform::from_xyz(0., -64., 0.), Color::GREEN),
+			(Transform::from_xyz(128., -64., 0.), Color::BLUE),
+		],
 	);
 }
diff --git a/src/levels/level1.rs b/src/levels/level1.rs
index 4c29b4c..f26df88 100644
--- a/src/levels/level1.rs
+++ b/src/levels/level1.rs
@@ -1,55 +1,73 @@
 use crate::game::*;
 
-use bevy::prelude::*;
+use bevy::prelude::{shape::Quad, *};
 use bevy_rapier2d::prelude::*;
 
 pub fn setup(
 	commands: &mut Commands,
+	meshes: &mut ResMut<Assets<Mesh>>,
 	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.))
+		.spawn_bundle(ColorMesh2dBundle {
+			mesh: meshes
+				.add(Mesh::from(Quad {
+					size: Vec2 { x: 800.0, y: 16.0 },
+					flip: false,
+				}))
+				.into(),
+			material: materials.add(ColorMaterial::from(Color::GRAY)),
+			transform: Transform::from_xyz(0.0, -256.0, 0.0),
+			..default()
+		})
+		.insert(Collider::cuboid(400., 8.))
 		.insert(Level);
 	commands
-		.spawn_bundle(TransformBundle::from(Transform::from_xyz(
-			256.0, -128.0, 0.0,
-		)))
-		.insert(Collider::cuboid(200., 10.))
+		.spawn_bundle(ColorMesh2dBundle {
+			mesh: meshes
+				.add(Mesh::from(Quad {
+					size: Vec2 { x: 400.0, y: 16.0 },
+					flip: false,
+				}))
+				.into(),
+			material: materials.add(ColorMaterial::from(Color::GRAY)),
+			transform: Transform::from_xyz(256.0, -128.0, 0.0),
+			..default()
+		})
+		.insert(Collider::cuboid(200., 8.))
 		.insert(Level);
 
-	spawn_character(
+	spawn_characters(
 		commands,
 		character_meshes,
 		materials,
-		selected_character_id,
-		character_id_list,
 		audio,
-		Transform::from_xyz(128., 64., 0.),
-		Color::BLUE,
-	);
-	spawn_character(
-		commands,
-		character_meshes,
-		materials,
-		selected_character_id,
-		character_id_list,
-		audio,
-		Transform::from_xyz(-128., -128., 0.),
-		Color::RED,
-	);
-	spawn_character(
-		commands,
-		character_meshes,
-		materials,
-		selected_character_id,
-		character_id_list,
-		audio,
-		Transform::from_xyz(0., -128., 0.),
-		Color::GREEN,
+		[
+			(Transform::from_xyz(128., 64., 0.), Color::BLUE),
+			(Transform::from_xyz(-128., -128., 0.), Color::RED),
+			(Transform::from_xyz(0., -128., 0.), Color::GREEN),
+		],
 	);
+
+	commands
+		.spawn_bundle(AbsorbingFilter {
+			color: FilterColor(Color::RED),
+			mesh: ColorMesh2dBundle {
+				mesh: meshes
+					.add(Mesh::from(Quad {
+						size: Vec2 { x: 128.0, y: 16.0 },
+						flip: false,
+					}))
+					.into(),
+				material: materials.add(Color::rgba(1., 0., 0., 0.5).into()),
+				transform: Transform::from_xyz(0., 0., 2.),
+				..Default::default()
+			},
+			collider: Collider::cuboid(64., 8.),
+			sensor: Sensor,
+			filter_type: PassThroughFilter::Absorbing,
+		})
+		.insert(Level);
 }
diff --git a/src/main.rs b/src/main.rs
index 7a19dab..b7fbbc2 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,11 +1,12 @@
 #[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::*;
 use bevy_rapier2d::prelude::*;
 
 #[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
@@ -23,15 +24,18 @@ fn main() {
 	std::thread::spawn(move || audio::setup(audio_event_receiver));
 
 	App::new()
+		.insert_resource(Msaa { samples: 4 })
 		.insert_resource(audio_event_sender)
 		.add_state(AppState::Menu)
+		.insert_resource(ClearColor(Color::BLACK))
 		.add_plugins(DefaultPlugins)
 		.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(bevy::window::close_on_esc)
 		.add_startup_system(setup)
 		.run();
 }
@@ -43,12 +47,7 @@ fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
 	let font: Handle<Font> = asset_server.load("UacariLegacy-Thin.ttf");
 	commands.insert_resource(font);
 
-	commands.spawn_bundle(Camera2dBundle {
-		camera_2d: Camera2d {
-			clear_color: ClearColorConfig::Custom(Color::BLACK),
-		},
-		..Default::default()
-	});
+	commands.spawn_bundle(Camera2dBundle::default());
 	commands.insert_resource(AmbientLight {
 		color: Color::WHITE,
 		brightness: 0.6,