diff --git a/src/main.rs b/src/main.rs
index 2a9ebaf..71ae3aa 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -46,22 +46,22 @@ mod test;
 #[allow(unused_imports)]
 use bevy_editor_pls::prelude::*;
 
-const SETTINGS_FILE_PATH: &'static str = "settings.toml";
+const CONFIG_FILE_PATH: &'static str = "config.toml";
 const KEYMAP_FILE_PATH: &'static str = "keymap.toml";
 
-fn save_settings(settings: Res<Settings>) {
-    let settings_toml = toml::to_string(&*settings).unwrap();
-    fs::write(SETTINGS_FILE_PATH, settings_toml).unwrap();
+fn save_config(config: Res<Config>) {
+    let config_toml = toml::to_string(&*config).unwrap();
+    fs::write(CONFIG_FILE_PATH, config_toml).unwrap();
 }
 
 #[bevy_main]
 fn main() {
-    if !Path::new(SETTINGS_FILE_PATH).is_file() {
-        let default_settings_toml = toml::to_string(&Settings::default()).unwrap();
-        fs::write(SETTINGS_FILE_PATH, default_settings_toml).unwrap();
+    if !Path::new(CONFIG_FILE_PATH).is_file() {
+        let default_config_toml = toml::to_string(&Config::default()).unwrap();
+        fs::write(CONFIG_FILE_PATH, default_config_toml).unwrap();
     }
-    let settings_toml = fs::read_to_string(SETTINGS_FILE_PATH).unwrap();
-    let settings: Settings = toml::from_str(settings_toml.as_str()).unwrap();
+    let config_toml = fs::read_to_string(CONFIG_FILE_PATH).unwrap();
+    let config: Config = toml::from_str(config_toml.as_str()).unwrap();
 
     if !Path::new(KEYMAP_FILE_PATH).is_file() {
         let default_keymap_toml = toml::to_string(&default_input_action_map()).unwrap();
@@ -72,7 +72,7 @@ fn main() {
 
     let player_movement = PlayerMovement {
         directions: VecDeque::new(),
-        timer: Timer::from_seconds(settings.player_move_speed, TimerMode::Repeating),
+        timer: Timer::from_seconds(config.player_move_speed, TimerMode::Repeating),
     };
 
     let mut app = App::new();
@@ -110,7 +110,7 @@ fn main() {
             update_button_state,
             handle_audio_event,
             adjust_viewport,
-            save_settings.run_if(resource_changed_or_removed::<Settings>()),
+            save_config.run_if(resource_changed_or_removed::<Config>()),
             (button_input_to_action, handle_actions).chain(),
         ),
     )
@@ -172,7 +172,7 @@ fn main() {
     app.init_resource::<ActionState<Action>>()
         .insert_resource(input_action_map);
 
-    app.insert_resource(settings)
+    app.insert_resource(config)
         .insert_resource(player_movement)
         .insert_resource(AutoMoveState::default());
 
diff --git a/src/resources.rs b/src/resources.rs
index 4aac05c..eeb309f 100644
--- a/src/resources.rs
+++ b/src/resources.rs
@@ -12,35 +12,35 @@ use std::collections::{HashMap, VecDeque};
 use std::sync::Mutex;
 
 #[derive(Resource, Serialize, Deserialize)]
-pub struct Settings {
-    /// Disable player movement animation.
-    pub instant_move: bool,
+pub struct Config {
     /// Player movement animation speed, seconds per step.
     pub player_move_speed: f32,
     /// Make the floor look like a chessboard with alternating light square and dark square.
     pub even_square_shades: f32,
-    /// Audio volume
+    /// Audio volume.
     pub volume: f64,
+    /// Disable player movement animation.
+    pub instant_move: bool,
     /// Enable auto switch to next unsolved level when the current level is solved.
     pub auto_switch_to_next_unsolved_level: bool,
-    pub solver: SolverSettings,
+    pub solver: SolverConfig,
 }
 
-impl Default for Settings {
+impl Default for Config {
     fn default() -> Self {
         Self {
-            instant_move: false,
             player_move_speed: 0.1,
             even_square_shades: 0.1,
             volume: 0.5,
+            instant_move: false,
             auto_switch_to_next_unsolved_level: true,
-            solver: SolverSettings::default(),
+            solver: SolverConfig::default(),
         }
     }
 }
 
 #[derive(Serialize, Deserialize, Default)]
-pub struct SolverSettings {
+pub struct SolverConfig {
     pub strategy: Strategy,
     pub lower_bound_method: LowerBoundMethod,
 }
diff --git a/src/systems/audio.rs b/src/systems/audio.rs
index 909443e..e701b99 100644
--- a/src/systems/audio.rs
+++ b/src/systems/audio.rs
@@ -8,7 +8,7 @@ use crate::resources::*;
 pub fn handle_audio_event(
     audio: Res<Audio>,
     asset_server: Res<AssetServer>,
-    settings: Res<Settings>,
+    config: Res<Config>,
     mut crate_enter_target_events: EventReader<CrateEnterTarget>,
     mut _crate_leave_target_events: EventReader<CrateLeaveTarget>,
     mut level_solved_events: EventReader<LevelSolved>,
@@ -16,12 +16,12 @@ pub fn handle_audio_event(
     for _ in level_solved_events.read() {
         audio
             .play(asset_server.load("audio/success.ogg"))
-            .with_volume(settings.volume);
+            .with_volume(config.volume);
         crate_enter_target_events.clear();
     }
     for _ in crate_enter_target_events.read() {
         audio
             .play(asset_server.load("audio/correct.ogg"))
-            .with_volume(settings.volume);
+            .with_volume(config.volume);
     }
 }
diff --git a/src/systems/auto_solve.rs b/src/systems/auto_solve.rs
index 4f2b4f8..fe01118 100644
--- a/src/systems/auto_solve.rs
+++ b/src/systems/auto_solve.rs
@@ -12,7 +12,7 @@ use std::time::{Duration, Instant};
 pub fn load_solver(
     mut solver_state: ResMut<SolverState>,
     board: Query<&Board>,
-    settings: Res<Settings>,
+    config: Res<Config>,
 ) {
     let board = &board.single().board;
     let SolverState {
@@ -24,8 +24,8 @@ pub fn load_solver(
     let mut solver = solver.lock().unwrap();
     *solver = Solver::new(
         level.clone(),
-        settings.solver.strategy,
-        settings.solver.lower_bound_method,
+        config.solver.strategy,
+        config.solver.lower_bound_method,
     );
     stopwatch.reset();
 }
diff --git a/src/systems/input.rs b/src/systems/input.rs
index 03d5342..722a986 100644
--- a/src/systems/input.rs
+++ b/src/systems/input.rs
@@ -100,7 +100,7 @@ pub fn handle_actions(
     mut player_movement: ResMut<PlayerMovement>,
     mut level_id: ResMut<LevelId>,
     database: Res<Database>,
-    mut settings: ResMut<Settings>,
+    mut config: ResMut<Config>,
 
     mut update_grid_position_events: EventWriter<UpdateGridPositionEvent>,
 ) {
@@ -125,7 +125,7 @@ pub fn handle_actions(
                 &database,
                 board,
             );
-            handle_toggle_instant_move_action(&action_state, &mut settings);
+            handle_toggle_instant_move_action(&action_state, &mut config);
             handle_toggle_toggle_fullscreen_action(&action_state, window);
             handle_undo_redo_action(
                 &action_state,
@@ -217,10 +217,10 @@ fn handle_clipboard_action(
 
 fn handle_toggle_instant_move_action(
     action_state: &ActionState<Action>,
-    settings: &mut ResMut<Settings>,
+    config: &mut ResMut<Config>,
 ) {
     if action_state.just_pressed(Action::ToggleInstantMove) {
-        settings.instant_move = !settings.instant_move;
+        config.instant_move = !config.instant_move;
     }
 }
 
diff --git a/src/systems/level.rs b/src/systems/level.rs
index c33d111..ee546cf 100644
--- a/src/systems/level.rs
+++ b/src/systems/level.rs
@@ -53,7 +53,7 @@ pub fn spawn_board(
     window: Query<&Window>,
     board: Query<Entity, With<Board>>,
     level_id: Res<LevelId>,
-    settings: Res<Settings>,
+    config: Res<Config>,
     asset_server: Res<AssetServer>,
     mut texture_atlases: ResMut<Assets<TextureAtlas>>,
 ) {
@@ -113,11 +113,11 @@ pub fn spawn_board(
                     for (tile, (sprite_index, z_order)) in tiles.into_iter() {
                         if level.get_unchecked(&position).intersects(tile) {
                             let mut sprite = TextureAtlasSprite::new(sprite_index);
-                            if settings.even_square_shades > 0.0
+                            if config.even_square_shades > 0.0
                                 && tile == Tile::Floor
                                 && (x + y) % 2 == 0
                             {
-                                sprite.color = Color::WHITE * (1.0 - settings.even_square_shades);
+                                sprite.color = Color::WHITE * (1.0 - config.even_square_shades);
                             }
                             let mut entity = parent.spawn((
                                 SpriteSheetBundle {
@@ -144,9 +144,9 @@ pub fn auto_switch_to_next_unsolved_level(
     mut board: Query<&mut Board>,
     mut level_id: ResMut<LevelId>,
     database: Res<Database>,
-    settings: Res<Settings>,
+    config: Res<Config>,
 ) {
-    if !settings.auto_switch_to_next_unsolved_level {
+    if !config.auto_switch_to_next_unsolved_level {
         return;
     }
     let database = database.lock().unwrap();
diff --git a/src/systems/render.rs b/src/systems/render.rs
index 6dc56b2..2d1cd0b 100644
--- a/src/systems/render.rs
+++ b/src/systems/render.rs
@@ -83,7 +83,7 @@ pub fn handle_player_movement(
     mut board: Query<&mut Board>,
     mut player_movement: ResMut<PlayerMovement>,
     time: Res<Time>,
-    settings: Res<Settings>,
+    config: Res<Config>,
     mut crate_enter_target_events: EventWriter<CrateEnterTarget>,
     mut crate_leave_target_events: EventWriter<CrateLeaveTarget>,
     mut level_solved_events: EventWriter<LevelSolved>,
@@ -95,7 +95,7 @@ pub fn handle_player_movement(
     let board = &mut board.single_mut().board;
 
     let player_grid_position = &mut **player.single_mut();
-    if !settings.instant_move {
+    if !config.instant_move {
         player_movement.timer.tick(time.delta());
         if !player_movement.timer.just_finished() {
             return;
@@ -161,11 +161,11 @@ pub fn handle_player_movement(
 pub fn smooth_tile_motion(
     mut tiles: Query<(&mut Transform, &GridPosition)>,
     board: Query<&Board>,
-    settings: Res<Settings>,
+    config: Res<Config>,
 ) {
     let Board { board, tile_size } = &board.single();
     for (mut transform, grid_position) in tiles.iter_mut() {
-        if !settings.instant_move {
+        if !config.instant_move {
             let lerp = |a: f32, b: f32, t: f32| a + (b - a) * t;
 
             let target_x = grid_position.x as f32 * tile_size.x;
diff --git a/src/systems/ui.rs b/src/systems/ui.rs
index 9836fcc..1712f8f 100644
--- a/src/systems/ui.rs
+++ b/src/systems/ui.rs
@@ -213,20 +213,20 @@ pub fn setup_button(mut commands: Commands, asset_server: Res<AssetServer>) {
         });
 }
 
-/// Updates the state of buttons based on settings.
+/// Updates the state of buttons based on config.
 pub fn update_button_state(
     mut buttons: Query<(&Action, &Children), With<Button>>,
     mut image: Query<&mut UiImage>,
-    settings: Res<Settings>,
+    config: Res<Config>,
     asset_server: Res<AssetServer>,
 ) {
-    if !settings.is_changed() {
+    if !config.is_changed() {
         return;
     }
     for (button, children) in &mut buttons {
         if *button == Action::ToggleInstantMove {
             let mut image = image.get_mut(children[0]).unwrap();
-            image.texture = if settings.instant_move {
+            image.texture = if config.instant_move {
                 asset_server.load("textures/instant_move_on.png").into()
             } else {
                 asset_server.load("textures/instant_move_off.png").into()