feat: stage sequence, ghost collisions & energizer logic, text color method, scheduler ordering

src/systems/components.rs

@@ -177,9 +177,6 @@ pub struct ScoreResource(pub u32);
 #[derive(Resource)]
 pub struct DeltaTime(pub f32);
 
-#[derive(Resource, Default)]
-pub struct RenderDirty(pub bool);
-
 /// Resource for tracking audio state
 #[derive(Resource, Debug, Clone, Default)]
 pub struct AudioState {
@@ -188,3 +185,228 @@ pub struct AudioState {
     /// Current sound index for cycling through eat sounds
     pub sound_index: usize,
 }
+
+/// Lifecycle state for the player entity.
+#[derive(Component, Debug, Clone, Copy, PartialEq, Eq)]
+pub enum PlayerLifecycle {
+    Spawning,
+    Alive,
+    Dying,
+    Respawning,
+}
+
+impl PlayerLifecycle {
+    /// Returns true when gameplay input and movement should be active
+    pub fn is_interactive(self) -> bool {
+        matches!(self, PlayerLifecycle::Alive)
+    }
+}
+
+impl Default for PlayerLifecycle {
+    fn default() -> Self {
+        PlayerLifecycle::Spawning
+    }
+}
+
+/// Whether player input should be processed.
+#[derive(Component, Debug, Clone, Copy, PartialEq, Eq)]
+pub enum ControlState {
+    InputEnabled,
+    InputLocked,
+}
+
+impl Default for ControlState {
+    fn default() -> Self {
+        Self::InputLocked
+    }
+}
+
+/// Combat-related state for Pac-Man. Tick-based energizer logic.
+#[derive(Component, Debug, Clone, Copy, PartialEq, Eq)]
+pub enum CombatState {
+    Normal,
+    Energized {
+        /// Remaining energizer duration in ticks (frames)
+        remaining_ticks: u32,
+        /// Ticks until flashing begins (counts down to 0, then flashing is active)
+        flash_countdown_ticks: u32,
+    },
+}
+
+impl Default for CombatState {
+    fn default() -> Self {
+        CombatState::Normal
+    }
+}
+
+impl CombatState {
+    pub fn is_energized(&self) -> bool {
+        matches!(self, CombatState::Energized { .. })
+    }
+
+    pub fn is_flashing(&self) -> bool {
+        matches!(self, CombatState::Energized { flash_countdown_ticks, .. } if *flash_countdown_ticks == 0)
+    }
+
+    pub fn deactivate_energizer(&mut self) {
+        *self = CombatState::Normal;
+    }
+
+    /// Activate energizer using tick-based durations.
+    pub fn activate_energizer_ticks(&mut self, total_ticks: u32, flash_lead_ticks: u32) {
+        let flash_countdown_ticks = total_ticks.saturating_sub(flash_lead_ticks);
+        *self = CombatState::Energized {
+            remaining_ticks: total_ticks,
+            flash_countdown_ticks,
+        };
+    }
+
+    /// Advance one frame. When ticks reach zero, returns to Normal.
+    pub fn tick_frame(&mut self) {
+        if let CombatState::Energized {
+            remaining_ticks,
+            flash_countdown_ticks,
+        } = self
+        {
+            if *remaining_ticks > 0 {
+                *remaining_ticks -= 1;
+                if *flash_countdown_ticks > 0 {
+                    *flash_countdown_ticks -= 1;
+                }
+            }
+            if *remaining_ticks == 0 {
+                *self = CombatState::Normal;
+            }
+        }
+    }
+}
+
+/// Movement modifiers that can affect Pac-Man's speed or handling.
+#[derive(Component, Debug, Clone, Copy)]
+pub struct MovementModifiers {
+    /// Multiplier applied to base speed (e.g., tunnels)
+    pub speed_multiplier: f32,
+    /// True when currently in a tunnel slowdown region
+    pub tunnel_slowdown_active: bool,
+}
+
+impl Default for MovementModifiers {
+    fn default() -> Self {
+        Self {
+            speed_multiplier: 1.0,
+            tunnel_slowdown_active: false,
+        }
+    }
+}
+
+/// Level-dependent timing configuration
+#[derive(Resource, Debug, Clone, Copy)]
+pub struct LevelTiming {
+    /// Duration of energizer effect in seconds
+    pub energizer_duration: f32,
+    /// Freeze duration at spawn/ready in seconds
+    pub spawn_freeze_duration: f32,
+    /// When to start flashing relative to energizer end (seconds)
+    pub energizer_flash_threshold: f32,
+}
+
+impl Default for LevelTiming {
+    fn default() -> Self {
+        Self {
+            energizer_duration: 6.0,
+            spawn_freeze_duration: 1.5,
+            energizer_flash_threshold: 2.0,
+        }
+    }
+}
+
+impl LevelTiming {
+    /// Returns timing configuration for a given level.
+    pub fn for_level(_level: u32) -> Self {
+        // Placeholder: tune per the Pac-Man Dossier tables
+        Self::default()
+    }
+}
+
+/// Tag component for entities that should be frozen during startup
+#[derive(Component, Debug, Clone, Copy)]
+pub struct Frozen;
+
+/// Convenience bundle for attaching the hybrid FSM to the player entity
+#[derive(Bundle, Default)]
+pub struct PlayerStateBundle {
+    pub lifecycle: PlayerLifecycle,
+    pub control: ControlState,
+    pub combat: CombatState,
+    pub movement_modifiers: MovementModifiers,
+}
+
+#[derive(Resource, Debug, Clone, Copy)]
+pub enum StartupSequence {
+    /// Stage 1: Text-only stage
+    /// - Player & ghosts are hidden
+    /// - READY! and PLAYER ONE text are shown
+    /// - Energizers do not blink
+    TextOnly {
+        /// Remaining ticks in this stage
+        remaining_ticks: u32,
+    },
+    /// Stage 2: Characters visible stage
+    /// - PLAYER ONE text is hidden, READY! text remains
+    /// - Ghosts and Pac-Man are now shown
+    CharactersVisible {
+        /// Remaining ticks in this stage
+        remaining_ticks: u32,
+    },
+    /// Stage 3: Game begins
+    /// - Final state, game is fully active
+    GameActive,
+}
+
+impl StartupSequence {
+    /// Creates a new StartupSequence with the specified duration in ticks
+    pub fn new(text_only_ticks: u32, _characters_visible_ticks: u32) -> Self {
+        Self::TextOnly {
+            remaining_ticks: text_only_ticks,
+        }
+    }
+
+    /// Returns true if the timer is still active (not in GameActive state)
+    pub fn is_active(&self) -> bool {
+        !matches!(self, StartupSequence::GameActive)
+    }
+
+    /// Returns true if we're in the game active stage
+    pub fn is_game_active(&self) -> bool {
+        matches!(self, StartupSequence::GameActive)
+    }
+
+    /// Ticks the timer by one frame, returning transition information if state changes
+    pub fn tick(&mut self) -> Option<(StartupSequence, StartupSequence)> {
+        match self {
+            StartupSequence::TextOnly { remaining_ticks } => {
+                if *remaining_ticks > 0 {
+                    *remaining_ticks -= 1;
+                    None
+                } else {
+                    let from = *self;
+                    *self = StartupSequence::CharactersVisible {
+                        remaining_ticks: 60, // 1 second at 60 FPS
+                    };
+                    Some((from, *self))
+                }
+            }
+            StartupSequence::CharactersVisible { remaining_ticks } => {
+                if *remaining_ticks > 0 {
+                    *remaining_ticks -= 1;
+                    None
+                } else {
+                    let from = *self;
+                    *self = StartupSequence::GameActive;
+                    Some((from, *self))
+                }
+            }
+            StartupSequence::GameActive => None,
+        }
+    }
+}

src/systems/ghost.rs

@@ -1,7 +1,15 @@
-use bevy_ecs::system::{Query, Res};
-use rand::prelude::*;
+use bevy_ecs::entity::Entity;
+use bevy_ecs::event::{EventReader, EventWriter};
+use bevy_ecs::query::{With, Without};
+use bevy_ecs::system::{Commands, Query, Res, ResMut};
+use rand::rngs::SmallRng;
+use rand::seq::IndexedRandom;
+use rand::SeedableRng;
 use smallvec::SmallVec;
 
+use crate::events::GameEvent;
+use crate::systems::audio::AudioEvent;
+use crate::systems::components::{Frozen, GhostCollider, ScoreResource};
 use crate::{
     map::{
         builder::Map,
@@ -9,7 +17,7 @@ use crate::{
         graph::{Edge, TraversalFlags},
     },
     systems::{
-        components::{DeltaTime, Ghost},
+        components::{CombatState, DeltaTime, Ghost, PlayerControlled},
         movement::{Position, Velocity},
     },
 };
@@ -18,7 +26,7 @@ use crate::{
 pub fn ghost_movement_system(
     map: Res<Map>,
     delta_time: Res<DeltaTime>,
-    mut ghosts: Query<(&Ghost, &mut Velocity, &mut Position)>,
+    mut ghosts: Query<(&Ghost, &mut Velocity, &mut Position), Without<Frozen>>,
 ) {
     for (_ghost, mut velocity, mut position) in ghosts.iter_mut() {
         let mut distance = velocity.speed * 60.0 * delta_time.0;
@@ -65,3 +73,46 @@ pub fn ghost_movement_system(
         }
     }
 }
+
+pub fn ghost_collision_system(
+    mut commands: Commands,
+    mut collision_events: EventReader<GameEvent>,
+    mut score: ResMut<ScoreResource>,
+    pacman_query: Query<&CombatState, With<PlayerControlled>>,
+    ghost_query: Query<(Entity, &Ghost), With<GhostCollider>>,
+    mut events: EventWriter<AudioEvent>,
+) {
+    for event in collision_events.read() {
+        if let GameEvent::Collision(entity1, entity2) = event {
+            // Check if one is Pacman and the other is a ghost
+            let (pacman_entity, ghost_entity) = if pacman_query.get(*entity1).is_ok() && ghost_query.get(*entity2).is_ok() {
+                (*entity1, *entity2)
+            } else if pacman_query.get(*entity2).is_ok() && ghost_query.get(*entity1).is_ok() {
+                (*entity2, *entity1)
+            } else {
+                continue;
+            };
+
+            // Check if Pac-Man is energized
+            if let Ok(combat_state) = pacman_query.get(pacman_entity) {
+                if combat_state.is_energized() {
+                    // Pac-Man eats the ghost
+                    if let Ok((ghost_ent, _ghost_type)) = ghost_query.get(ghost_entity) {
+                        // Add score (200 points per ghost eaten)
+                        score.0 += 200;
+
+                        // Remove the ghost
+                        commands.entity(ghost_ent).despawn();
+
+                        // Play eat sound
+                        events.write(AudioEvent::PlayEat);
+                    }
+                } else {
+                    // Pac-Man dies (this would need a death system)
+                    // For now, just log it
+                    tracing::warn!("Pac-Man collided with ghost while not energized!");
+                }
+            }
+        }
+    }
+}

src/systems/item.rs

@@ -4,7 +4,7 @@ use crate::{
     events::GameEvent,
     systems::{
         audio::AudioEvent,
-        components::{EntityType, ItemCollider, PacmanCollider, ScoreResource},
+        components::{CombatState, EntityType, ItemCollider, LevelTiming, PacmanCollider, ScoreResource},
     },
 };
 
@@ -24,8 +24,10 @@ pub fn item_system(
     mut collision_events: EventReader<GameEvent>,
     mut score: ResMut<ScoreResource>,
     pacman_query: Query<Entity, With<PacmanCollider>>,
+    mut combat_q: Query<&mut CombatState, With<PacmanCollider>>,
     item_query: Query<(Entity, &EntityType), With<ItemCollider>>,
     mut events: EventWriter<AudioEvent>,
+    level_timing: Res<LevelTiming>,
 ) {
     for event in collision_events.read() {
         if let GameEvent::Collision(entity1, entity2) = event {
@@ -50,6 +52,19 @@ pub fn item_system(
                     if entity_type.is_collectible() {
                         events.write(AudioEvent::PlayEat);
                     }
+
+                    // Activate energizer on power pellet using tick-based durations
+                    if *entity_type == EntityType::PowerPellet {
+                        if let Ok(mut combat) = combat_q.single_mut() {
+                            // Convert seconds to frames (assumes 60 FPS)
+                            let total_ticks = (level_timing.energizer_duration * 60.0).round().clamp(0.0, u32::MAX as f32) as u32;
+                            // Flash lead: e.g., 3 seconds (180 ticks) before end; ensure it doesn't underflow
+                            let flash_lead_ticks = (level_timing.energizer_flash_threshold * 60.0)
+                                .round()
+                                .clamp(0.0, u32::MAX as f32) as u32;
+                            combat.activate_energizer_ticks(total_ticks, flash_lead_ticks);
+                        }
+                    }
                 }
             }
         }

src/systems/mod.rs

@@ -16,3 +16,4 @@ pub mod movement;
 pub mod player;
 pub mod profiling;
 pub mod render;
+pub mod stage;

src/systems/player.rs

@@ -1,6 +1,7 @@
 use bevy_ecs::{
+    entity::Entity,
     event::{EventReader, EventWriter},
-    prelude::ResMut,
+    prelude::{Commands, ResMut},
     query::With,
     system::{Query, Res},
 };
@@ -11,7 +12,10 @@ use crate::{
     map::builder::Map,
     map::graph::Edge,
     systems::{
-        components::{AudioState, DeltaTime, EntityType, GlobalState, PlayerControlled},
+        components::{
+            AudioState, ControlState, DeltaTime, EntityType, Frozen, GhostCollider, GlobalState, MovementModifiers,
+            PlayerControlled, PlayerLifecycle, StartupSequence,
+        },
         debug::DebugState,
         movement::{BufferedDirection, Position, Velocity},
     },
@@ -28,12 +32,12 @@ pub fn player_control_system(
     mut state: ResMut<GlobalState>,
     mut debug_state: ResMut<DebugState>,
     mut audio_state: ResMut<AudioState>,
-    mut players: Query<&mut BufferedDirection, With<PlayerControlled>>,
+    mut players: Query<(&PlayerLifecycle, &ControlState, &mut BufferedDirection), With<PlayerControlled>>,
     mut errors: EventWriter<GameError>,
 ) {
     // Get the player's movable component (ensuring there is only one player)
-    let mut buffered_direction = match players.single_mut() {
-        Ok(buffered_direction) => buffered_direction,
+    let (lifecycle, control, mut buffered_direction) = match players.single_mut() {
+        Ok(tuple) => tuple,
         Err(e) => {
             errors.write(GameError::InvalidState(format!(
                 "No/multiple entities queried for player system: {}",
@@ -43,15 +47,20 @@ pub fn player_control_system(
         }
     };
 
+    // If the player is not interactive or input is locked, ignore movement commands
+    let allow_input = lifecycle.is_interactive() && matches!(control, ControlState::InputEnabled);
+
     // Handle events
     for event in events.read() {
         if let GameEvent::Command(command) = event {
             match command {
                 GameCommand::MovePlayer(direction) => {
-                    *buffered_direction = BufferedDirection::Some {
-                        direction: *direction,
-                        remaining_time: 0.25,
-                    };
+                    if allow_input {
+                        *buffered_direction = BufferedDirection::Some {
+                            direction: *direction,
+                            remaining_time: 0.25,
+                        };
+                    }
                 }
                 GameCommand::Exit => {
                     state.exit = true;
@@ -82,10 +91,24 @@ pub fn can_traverse(entity_type: EntityType, edge: Edge) -> bool {
 pub fn player_movement_system(
     map: Res<Map>,
     delta_time: Res<DeltaTime>,
-    mut entities: Query<(&mut Position, &mut Velocity, &mut BufferedDirection), With<PlayerControlled>>,
+    mut entities: Query<
+        (
+            &PlayerLifecycle,
+            &ControlState,
+            &MovementModifiers,
+            &mut Position,
+            &mut Velocity,
+            &mut BufferedDirection,
+        ),
+        With<PlayerControlled>,
+    >,
     // mut errors: EventWriter<GameError>,
 ) {
-    for (mut position, mut velocity, mut buffered_direction) in entities.iter_mut() {
+    for (lifecycle, control, modifiers, mut position, mut velocity, mut buffered_direction) in entities.iter_mut() {
+        if !lifecycle.is_interactive() || !matches!(control, ControlState::InputEnabled) {
+            continue;
+        }
+
         // Decrement the buffered direction remaining time
         if let BufferedDirection::Some {
             direction,
@@ -102,7 +125,7 @@ pub fn player_movement_system(
             }
         }
 
-        let mut distance = velocity.speed * 60.0 * delta_time.0;
+        let mut distance = velocity.speed * modifiers.speed_multiplier * 60.0 * delta_time.0;
 
         loop {
             match *position {
@@ -151,3 +174,16 @@ pub fn player_movement_system(
         }
     }
 }
+
+/// Applies tunnel slowdown based on the current node tile
+pub fn player_tunnel_slowdown_system(map: Res<Map>, mut q: Query<(&Position, &mut MovementModifiers), With<PlayerControlled>>) {
+    if let Ok((position, mut modifiers)) = q.single_mut() {
+        let node = position.current_node();
+        let in_tunnel = map
+            .tile_at_node(node)
+            .map(|t| t == crate::constants::MapTile::Tunnel)
+            .unwrap_or(false);
+        modifiers.tunnel_slowdown_active = in_tunnel;
+        modifiers.speed_multiplier = if in_tunnel { 0.6 } else { 1.0 };
+    }
+}

src/systems/profiling.rs

@@ -34,6 +34,8 @@ pub enum SystemId {
     Collision,
     Item,
     PlayerMovement,
+    GhostCollision,
+    Stage,
 }
 
 impl Display for SystemId {

src/systems/render.rs

@@ -1,17 +1,26 @@
+use crate::constants::CANVAS_SIZE;
 use crate::error::{GameError, TextureError};
 use crate::map::builder::Map;
-use crate::systems::components::{DeltaTime, DirectionalAnimated, RenderDirty, Renderable, ScoreResource};
+use crate::systems::blinking::Blinking;
+use crate::systems::components::{
+    DeltaTime, DirectionalAnimated, EntityType, GhostCollider, PlayerControlled, Renderable, ScoreResource, StartupSequence,
+};
 use crate::systems::movement::{Position, Velocity};
 use crate::texture::sprite::SpriteAtlas;
 use crate::texture::text::TextTexture;
 use bevy_ecs::entity::Entity;
 use bevy_ecs::event::EventWriter;
-use bevy_ecs::prelude::{Changed, Or, RemovedComponents};
+use bevy_ecs::prelude::{Changed, Or, RemovedComponents, With, Without};
+use bevy_ecs::resource::Resource;
 use bevy_ecs::system::{NonSendMut, Query, Res, ResMut};
+use sdl2::pixels::Color;
 use sdl2::rect::{Point, Rect};
 use sdl2::render::{Canvas, Texture};
 use sdl2::video::Window;
 
+#[derive(Resource, Default)]
+pub struct RenderDirty(pub bool);
+
 #[allow(clippy::type_complexity)]
 pub fn dirty_render_system(
     mut dirty: ResMut<RenderDirty>,
@@ -62,16 +71,67 @@ pub struct MapTextureResource(pub Texture<'static>);
 /// A non-send resource for the backbuffer texture. This just wraps the texture with a type so it can be differentiated when exposed as a resource.
 pub struct BackbufferResource(pub Texture<'static>);
 
+/// Updates entity visibility based on StartupSequence stages
+pub fn ready_visibility_system(
+    startup: Res<StartupSequence>,
+    mut player_query: Query<&mut Renderable, (With<PlayerControlled>, Without<GhostCollider>)>,
+    mut ghost_query: Query<&mut Renderable, (With<GhostCollider>, Without<PlayerControlled>)>,
+    mut energizer_query: Query<(&mut Blinking, &EntityType)>,
+) {
+    match *startup {
+        StartupSequence::TextOnly { .. } => {
+            // Hide player and ghosts, disable energizer blinking
+            if let Ok(mut renderable) = player_query.single_mut() {
+                renderable.visible = false;
+            }
+
+            for mut renderable in ghost_query.iter_mut() {
+                renderable.visible = false;
+            }
+
+            // Disable energizer blinking in text-only stage
+            for (mut blinking, entity_type) in energizer_query.iter_mut() {
+                if matches!(entity_type, EntityType::PowerPellet) {
+                    blinking.timer = 0.0; // Reset timer to prevent blinking
+                }
+            }
+        }
+        StartupSequence::CharactersVisible { .. } => {
+            // Show player and ghosts, enable energizer blinking
+            if let Ok(mut renderable) = player_query.single_mut() {
+                renderable.visible = true;
+            }
+
+            for mut renderable in ghost_query.iter_mut() {
+                renderable.visible = true;
+            }
+
+            // Energizer blinking is handled by the blinking system
+        }
+        StartupSequence::GameActive => {
+            // All entities are visible and blinking is normal
+            if let Ok(mut renderable) = player_query.single_mut() {
+                renderable.visible = true;
+            }
+
+            for mut renderable in ghost_query.iter_mut() {
+                renderable.visible = true;
+            }
+        }
+    }
+}
+
 /// Renders the HUD (score, lives, etc.) on top of the game.
 pub fn hud_render_system(
     mut canvas: NonSendMut<&mut Canvas<Window>>,
     mut atlas: NonSendMut<SpriteAtlas>,
     score: Res<ScoreResource>,
+    startup: Res<StartupSequence>,
     mut errors: EventWriter<GameError>,
 ) {
     let mut text_renderer = TextTexture::new(1.0);
 
-    // Render lives and high score text
+    // Render lives and high score text in white
     let lives = 3; // TODO: Get from actual lives resource
     let lives_text = format!("{lives}UP   HIGH SCORE   ");
     let lives_position = glam::UVec2::new(4 + 8 * 3, 2); // x_offset + lives_offset * 8, y_offset
@@ -80,7 +140,7 @@ pub fn hud_render_system(
         errors.write(TextureError::RenderFailed(format!("Failed to render lives text: {}", e)).into());
     }
 
-    // Render score text
+    // Render score text in yellow (Pac-Man's color)
     let score_text = format!("{:02}", score.0);
     let score_offset = 7 - (score_text.len() as i32);
     let score_position = glam::UVec2::new(4 + 8 * score_offset as u32, 10); // x_offset + score_offset * 8, 8 + y_offset
@@ -88,6 +148,31 @@ pub fn hud_render_system(
     if let Err(e) = text_renderer.render(&mut canvas, &mut atlas, &score_text, score_position) {
         errors.write(TextureError::RenderFailed(format!("Failed to render score text: {}", e)).into());
     }
+
+    // Render text based on StartupSequence stage
+    if matches!(
+        *startup,
+        StartupSequence::TextOnly { .. } | StartupSequence::CharactersVisible { .. }
+    ) {
+        let ready_text = "READY!";
+        let ready_width = text_renderer.text_width(ready_text);
+        let ready_position = glam::UVec2::new((CANVAS_SIZE.x - ready_width) / 2, 160);
+        if let Err(e) = text_renderer.render_with_color(&mut canvas, &mut atlas, ready_text, ready_position, Color::YELLOW) {
+            errors.write(TextureError::RenderFailed(format!("Failed to render READY text: {}", e)).into());
+        }
+
+        if matches!(*startup, StartupSequence::TextOnly { .. }) {
+            let player_one_text = "PLAYER ONE";
+            let player_one_width = text_renderer.text_width(player_one_text);
+            let player_one_position = glam::UVec2::new((CANVAS_SIZE.x - player_one_width) / 2, 113);
+
+            if let Err(e) =
+                text_renderer.render_with_color(&mut canvas, &mut atlas, player_one_text, player_one_position, Color::CYAN)
+            {
+                errors.write(TextureError::RenderFailed(format!("Failed to render PLAYER ONE text: {}", e)).into());
+            }
+        }
+    }
 }
 
 #[allow(clippy::too_many_arguments)]

src/systems/stage.rs

@@ -0,0 +1,33 @@
+use bevy_ecs::{
+    prelude::{Commands, Entity, Query, With},
+    system::ResMut,
+};
+
+use crate::systems::components::{Frozen, GhostCollider, PlayerControlled, StartupSequence};
+
+/// Handles startup sequence transitions and component management
+pub fn startup_stage_system(
+    mut startup: ResMut<StartupSequence>,
+    mut commands: Commands,
+    mut player_query: Query<Entity, With<PlayerControlled>>,
+    mut ghost_query: Query<Entity, With<GhostCollider>>,
+) {
+    if let Some((from, to)) = startup.tick() {
+        match (from, to) {
+            (StartupSequence::TextOnly { .. }, StartupSequence::CharactersVisible { .. }) => {
+                // TODO: Add TextOnly tag component to hide entities
+                // TODO: Add CharactersVisible tag component to show entities
+                // TODO: Remove TextOnly tag component
+            }
+            (StartupSequence::CharactersVisible { .. }, StartupSequence::GameActive) => {
+                // Remove Frozen tag from all entities
+                for entity in player_query.iter_mut().chain(ghost_query.iter_mut()) {
+                    commands.entity(entity).remove::<Frozen>();
+                }
+                // TODO: Add GameActive tag component
+                // TODO: Remove CharactersVisible tag component
+            }
+            _ => {}
+        }
+    }
+}