diff --git a/solitaire_app/src/main.rs b/solitaire_app/src/main.rs
index 9eb9bd3..23b1563 100644
--- a/solitaire_app/src/main.rs
+++ b/solitaire_app/src/main.rs
@@ -1,7 +1,7 @@
 use bevy::prelude::*;
 use solitaire_engine::{
-    AchievementPlugin, AnimationPlugin, CardPlugin, GamePlugin, InputPlugin, ProgressPlugin,
-    StatsPlugin, TablePlugin,
+    AchievementPlugin, AnimationPlugin, CardPlugin, DailyChallengePlugin, GamePlugin, InputPlugin,
+    ProgressPlugin, StatsPlugin, TablePlugin,
 };
 
 fn main() {
@@ -22,7 +22,8 @@ fn main() {
         .add_plugins(InputPlugin)
         .add_plugins(AnimationPlugin)
         .add_plugins(StatsPlugin::default())
-        .add_plugins(AchievementPlugin::default())
         .add_plugins(ProgressPlugin::default())
+        .add_plugins(AchievementPlugin::default())
+        .add_plugins(DailyChallengePlugin)
         .run();
 }
diff --git a/solitaire_core/src/achievement.rs b/solitaire_core/src/achievement.rs
index 193add8..9ee95dd 100644
--- a/solitaire_core/src/achievement.rs
+++ b/solitaire_core/src/achievement.rs
@@ -20,6 +20,10 @@ pub struct AchievementContext {
     pub lifetime_score: u64,
     pub draw_three_wins: u32,
 
+    // Progression.
+    /// Current daily-challenge completion streak (consecutive days).
+    pub daily_challenge_streak: u32,
+
     // Last-win facts (GameWonEvent + GameState at win time).
     pub last_win_score: i32,
     pub last_win_time_seconds: u64,
@@ -96,6 +100,9 @@ fn early_bird(c: &AchievementContext) -> bool {
 fn speed_and_skill(c: &AchievementContext) -> bool {
     c.last_win_time_seconds < 90 && !c.last_win_used_undo
 }
+fn daily_devotee(c: &AchievementContext) -> bool {
+    c.daily_challenge_streak >= 7
+}
 
 /// All currently-evaluable achievements. Order is stable so persistence files
 /// remain readable across versions (new achievements append).
@@ -198,6 +205,13 @@ pub const ALL_ACHIEVEMENTS: &[AchievementDef] = &[
         secret: true,
         condition: speed_and_skill,
     },
+    AchievementDef {
+        id: "daily_devotee",
+        name: "Daily Devotee",
+        description: "Complete the daily challenge 7 days in a row",
+        secret: false,
+        condition: daily_devotee,
+    },
 ];
 
 /// Return every `AchievementDef` whose condition is satisfied by `ctx`.
@@ -225,6 +239,7 @@ mod tests {
             best_single_score: 0,
             lifetime_score: 0,
             draw_three_wins: 0,
+            daily_challenge_streak: 0,
             last_win_score: 0,
             last_win_time_seconds: u64::MAX,
             last_win_used_undo: true,
@@ -310,6 +325,18 @@ mod tests {
         assert!(!ids.contains(&"night_owl"));
     }
 
+    #[test]
+    fn daily_devotee_requires_7_day_streak() {
+        let mut c = ctx();
+        c.daily_challenge_streak = 6;
+        let ids: Vec<&str> = check_achievements(&c).iter().map(|d| d.id).collect();
+        assert!(!ids.contains(&"daily_devotee"));
+
+        c.daily_challenge_streak = 7;
+        let ids: Vec<&str> = check_achievements(&c).iter().map(|d| d.id).collect();
+        assert!(ids.contains(&"daily_devotee"));
+    }
+
     #[test]
     fn achievement_by_id_finds_known_and_returns_none_for_unknown() {
         assert_eq!(achievement_by_id("first_win").map(|d| d.name), Some("First Win"));
diff --git a/solitaire_data/src/lib.rs b/solitaire_data/src/lib.rs
index 938bee5..7956f8d 100644
--- a/solitaire_data/src/lib.rs
+++ b/solitaire_data/src/lib.rs
@@ -48,6 +48,6 @@ pub use achievements::{
 
 pub mod progress;
 pub use progress::{
-    level_for_xp, load_progress_from, progress_file_path, save_progress_to, xp_for_win,
-    PlayerProgress,
+    daily_seed_for, level_for_xp, load_progress_from, progress_file_path, save_progress_to,
+    xp_for_win, PlayerProgress,
 };
diff --git a/solitaire_data/src/progress.rs b/solitaire_data/src/progress.rs
index 23e7e41..26c1713 100644
--- a/solitaire_data/src/progress.rs
+++ b/solitaire_data/src/progress.rs
@@ -7,7 +7,7 @@ use std::fs;
 use std::io;
 use std::path::{Path, PathBuf};
 
-use chrono::{DateTime, NaiveDate, Utc};
+use chrono::{DateTime, Datelike, Duration, NaiveDate, Utc};
 use serde::{Deserialize, Serialize};
 
 const APP_DIR_NAME: &str = "solitaire_quest";
@@ -25,6 +25,15 @@ pub fn level_for_xp(xp: u64) -> u32 {
     }
 }
 
+/// Deterministic seed derived from a date, identical for all players globally.
+/// Used as the RNG seed for the daily-challenge deal.
+pub fn daily_seed_for(date: NaiveDate) -> u64 {
+    let y = date.year() as u64;
+    let m = date.month() as u64;
+    let d = date.day() as u64;
+    y * 10_000 + m * 100 + d
+}
+
 /// XP awarded for winning a game.
 ///
 /// Base 50 + scaled fast-win bonus (10..=50 for sub-2-minute wins) + 25 if
@@ -86,6 +95,29 @@ impl PlayerProgress {
     pub fn leveled_up_from(&self, prev_level: u32) -> bool {
         self.level > prev_level
     }
+
+    /// Record a daily-challenge completion for `date`.
+    ///
+    /// - First completion ever, or a gap of more than one day: streak resets to 1.
+    /// - Completion the day after the previous: streak increments.
+    /// - Same day as the previous: no-op (idempotent — a player can't double-count).
+    ///
+    /// Returns `true` if this call recorded a fresh completion (i.e. it wasn't
+    /// the same-day no-op case).
+    pub fn record_daily_completion(&mut self, date: NaiveDate) -> bool {
+        match self.daily_challenge_last_completed {
+            Some(last) if last == date => return false,
+            Some(last) if last + Duration::days(1) == date => {
+                self.daily_challenge_streak = self.daily_challenge_streak.saturating_add(1);
+            }
+            _ => {
+                self.daily_challenge_streak = 1;
+            }
+        }
+        self.daily_challenge_last_completed = Some(date);
+        self.last_modified = Utc::now();
+        true
+    }
 }
 
 /// Platform-specific default path for `progress.json`.
@@ -243,4 +275,61 @@ mod tests {
         save_progress_to(&path, &PlayerProgress::default()).expect("save");
         assert!(!path.with_extension("json.tmp").exists());
     }
+
+    // --- Daily challenge ---
+
+    #[test]
+    fn daily_seed_is_deterministic_per_date() {
+        let d = NaiveDate::from_ymd_opt(2026, 4, 24).unwrap();
+        assert_eq!(daily_seed_for(d), daily_seed_for(d));
+    }
+
+    #[test]
+    fn daily_seed_differs_across_dates() {
+        let a = NaiveDate::from_ymd_opt(2026, 4, 24).unwrap();
+        let b = NaiveDate::from_ymd_opt(2026, 4, 25).unwrap();
+        assert_ne!(daily_seed_for(a), daily_seed_for(b));
+    }
+
+    #[test]
+    fn first_daily_completion_starts_streak_at_1() {
+        let mut p = PlayerProgress::default();
+        let d = NaiveDate::from_ymd_opt(2026, 4, 24).unwrap();
+        let recorded = p.record_daily_completion(d);
+        assert!(recorded);
+        assert_eq!(p.daily_challenge_streak, 1);
+        assert_eq!(p.daily_challenge_last_completed, Some(d));
+    }
+
+    #[test]
+    fn consecutive_days_increment_streak() {
+        let mut p = PlayerProgress::default();
+        let d1 = NaiveDate::from_ymd_opt(2026, 4, 24).unwrap();
+        let d2 = d1 + Duration::days(1);
+        let d3 = d2 + Duration::days(1);
+        p.record_daily_completion(d1);
+        p.record_daily_completion(d2);
+        p.record_daily_completion(d3);
+        assert_eq!(p.daily_challenge_streak, 3);
+    }
+
+    #[test]
+    fn skipped_day_resets_streak_to_1() {
+        let mut p = PlayerProgress::default();
+        let d1 = NaiveDate::from_ymd_opt(2026, 4, 24).unwrap();
+        let d3 = d1 + Duration::days(2); // skipped d2
+        p.record_daily_completion(d1);
+        p.record_daily_completion(d3);
+        assert_eq!(p.daily_challenge_streak, 1);
+    }
+
+    #[test]
+    fn same_day_completion_is_idempotent() {
+        let mut p = PlayerProgress::default();
+        let d = NaiveDate::from_ymd_opt(2026, 4, 24).unwrap();
+        p.record_daily_completion(d);
+        let recorded_again = p.record_daily_completion(d);
+        assert!(!recorded_again, "same-day completion must report no-op");
+        assert_eq!(p.daily_challenge_streak, 1);
+    }
 }
diff --git a/solitaire_engine/src/achievement_plugin.rs b/solitaire_engine/src/achievement_plugin.rs
index 722ff31..097fad1 100644
--- a/solitaire_engine/src/achievement_plugin.rs
+++ b/solitaire_engine/src/achievement_plugin.rs
@@ -18,6 +18,7 @@ use solitaire_data::{
 
 use crate::events::{AchievementUnlockedEvent, GameWonEvent};
 use crate::game_plugin::GameMutation;
+use crate::progress_plugin::{ProgressResource, ProgressUpdate};
 use crate::resources::GameStateResource;
 use crate::stats_plugin::{StatsResource, StatsUpdate};
 
@@ -66,20 +67,26 @@ impl Plugin for AchievementPlugin {
             .insert_resource(AchievementsStoragePath(self.storage_path.clone()))
             .add_event::<AchievementUnlockedEvent>()
             .add_event::<GameWonEvent>()
-            // Run after GameMutation (so GameWonEvent is available) and after
-            // StatsUpdate (so StatsResource already reflects this win).
+            // Run after GameMutation (so GameWonEvent is available), after
+            // StatsUpdate (so stats reflect this win), and after ProgressUpdate
+            // (so daily_challenge_streak is up to date for daily_devotee).
             .add_systems(
                 Update,
-                evaluate_on_win.after(GameMutation).after(StatsUpdate),
+                evaluate_on_win
+                    .after(GameMutation)
+                    .after(StatsUpdate)
+                    .after(ProgressUpdate),
             );
     }
 }
 
+#[allow(clippy::too_many_arguments)]
 fn evaluate_on_win(
     mut wins: EventReader<GameWonEvent>,
     mut unlocks: EventWriter<AchievementUnlockedEvent>,
     game: Res<GameStateResource>,
     stats: Res<StatsResource>,
+    progress: Res<ProgressResource>,
     path: Res<AchievementsStoragePath>,
     mut achievements: ResMut<AchievementsResource>,
 ) {
@@ -94,6 +101,7 @@ fn evaluate_on_win(
         best_single_score: stats.0.best_single_score,
         lifetime_score: stats.0.lifetime_score,
         draw_three_wins: stats.0.draw_three_wins,
+        daily_challenge_streak: progress.0.daily_challenge_streak,
         last_win_score: ev.score,
         last_win_time_seconds: ev.time_seconds,
         last_win_used_undo: game.0.undo_count > 0,
@@ -149,6 +157,7 @@ mod tests {
             .add_plugins(GamePlugin)
             .add_plugins(TablePlugin)
             .add_plugins(StatsPlugin::headless())
+            .add_plugins(crate::progress_plugin::ProgressPlugin::headless())
             .add_plugins(AchievementPlugin::headless());
         // StatsPlugin's UI toggle system reads ButtonInput<KeyCode>; under
         // MinimalPlugins it isn't auto-registered.
diff --git a/solitaire_engine/src/animation_plugin.rs b/solitaire_engine/src/animation_plugin.rs
index a0ff7c5..cfdff29 100644
--- a/solitaire_engine/src/animation_plugin.rs
+++ b/solitaire_engine/src/animation_plugin.rs
@@ -10,12 +10,14 @@ use crate::card_plugin::CardEntity;
 use crate::events::{AchievementUnlockedEvent, GameWonEvent};
 use crate::game_plugin::GameMutation;
 use crate::layout::LayoutResource;
+use crate::progress_plugin::LevelUpEvent;
 
 /// Duration of a card slide (move) animation in seconds.
 pub const SLIDE_SECS: f32 = 0.15;
 
 const WIN_TOAST_SECS: f32 = 4.0;
 const ACHIEVEMENT_TOAST_SECS: f32 = 3.0;
+const LEVELUP_TOAST_SECS: f32 = 3.0;
 const CASCADE_STAGGER: f32 = 0.05;
 const CASCADE_DURATION: f32 = 0.5;
 
@@ -50,12 +52,14 @@ impl Plugin for AnimationPlugin {
         // is idempotent in Bevy.
         app.add_event::<GameWonEvent>()
             .add_event::<AchievementUnlockedEvent>()
+            .add_event::<LevelUpEvent>()
             .add_systems(
                 Update,
                 (
                     advance_card_anims,
                     handle_win_cascade,
                     handle_achievement_toast,
+                    handle_levelup_toast,
                     tick_toasts,
                 )
                     .after(GameMutation),
@@ -133,6 +137,16 @@ fn handle_achievement_toast(
     }
 }
 
+fn handle_levelup_toast(mut commands: Commands, mut events: EventReader<LevelUpEvent>) {
+    for ev in events.read() {
+        spawn_toast(
+            &mut commands,
+            format!("Level Up! → {}", ev.new_level),
+            LEVELUP_TOAST_SECS,
+        );
+    }
+}
+
 fn tick_toasts(
     mut commands: Commands,
     time: Res<Time>,
diff --git a/solitaire_engine/src/daily_challenge_plugin.rs b/solitaire_engine/src/daily_challenge_plugin.rs
new file mode 100644
index 0000000..02cc452
--- /dev/null
+++ b/solitaire_engine/src/daily_challenge_plugin.rs
@@ -0,0 +1,223 @@
+//! Tracks the per-date daily challenge: a deterministic seed every player
+//! sees on a given calendar day, plus completion bookkeeping.
+//!
+//! When the player wins a game whose seed matches today's daily seed and
+//! today's date hasn't been completed yet, this plugin:
+//!   - calls `PlayerProgress::record_daily_completion`
+//!   - awards a fixed XP bonus (`DAILY_BONUS_XP`)
+//!   - persists progress
+//!   - emits `DailyChallengeCompletedEvent`
+//!
+//! Pressing **C** fires a `NewGameRequestEvent` with today's daily seed so
+//! the player can start a fresh attempt.
+
+use bevy::input::ButtonInput;
+use bevy::prelude::*;
+use chrono::{Local, NaiveDate};
+use solitaire_data::{daily_seed_for, save_progress_to};
+
+use crate::events::{GameWonEvent, NewGameRequestEvent};
+use crate::game_plugin::GameMutation;
+use crate::progress_plugin::{ProgressResource, ProgressStoragePath, ProgressUpdate};
+use crate::resources::GameStateResource;
+
+/// Bonus XP awarded for completing today's daily challenge.
+pub const DAILY_BONUS_XP: u64 = 100;
+
+/// The active daily challenge — date + RNG seed for that date's deal.
+#[derive(Resource, Debug, Clone, Copy)]
+pub struct DailyChallengeResource {
+    pub date: NaiveDate,
+    pub seed: u64,
+}
+
+impl DailyChallengeResource {
+    pub fn for_today() -> Self {
+        let date = Local::now().date_naive();
+        Self {
+            date,
+            seed: daily_seed_for(date),
+        }
+    }
+}
+
+/// Fired when the player has just completed today's daily challenge.
+#[derive(Event, Debug, Clone, Copy)]
+pub struct DailyChallengeCompletedEvent {
+    pub date: NaiveDate,
+    pub streak: u32,
+}
+
+pub struct DailyChallengePlugin;
+
+impl Plugin for DailyChallengePlugin {
+    fn build(&self, app: &mut App) {
+        app.insert_resource(DailyChallengeResource::for_today())
+            .add_event::<DailyChallengeCompletedEvent>()
+            .add_event::<GameWonEvent>()
+            .add_event::<NewGameRequestEvent>()
+            // record/award after the base ProgressUpdate so we don't fight
+            // ProgressPlugin's add_xp on the same frame.
+            .add_systems(Update, handle_daily_completion.after(ProgressUpdate))
+            .add_systems(Update, handle_start_daily_request.before(GameMutation));
+    }
+}
+
+fn handle_daily_completion(
+    mut wins: EventReader<GameWonEvent>,
+    daily: Res<DailyChallengeResource>,
+    game: Res<GameStateResource>,
+    mut progress: ResMut<ProgressResource>,
+    path: Res<ProgressStoragePath>,
+    mut completed: EventWriter<DailyChallengeCompletedEvent>,
+) {
+    for _ in wins.read() {
+        if game.0.seed != daily.seed {
+            continue;
+        }
+        if !progress.0.record_daily_completion(daily.date) {
+            // Already counted today — no-op.
+            continue;
+        }
+        progress.0.add_xp(DAILY_BONUS_XP);
+        if let Some(target) = &path.0 {
+            if let Err(e) = save_progress_to(target, &progress.0) {
+                warn!("failed to save progress after daily completion: {e}");
+            }
+        }
+        completed.send(DailyChallengeCompletedEvent {
+            date: daily.date,
+            streak: progress.0.daily_challenge_streak,
+        });
+    }
+}
+
+fn handle_start_daily_request(
+    keys: Res<ButtonInput<KeyCode>>,
+    daily: Res<DailyChallengeResource>,
+    mut new_game: EventWriter<NewGameRequestEvent>,
+) {
+    if keys.just_pressed(KeyCode::KeyC) {
+        new_game.send(NewGameRequestEvent {
+            seed: Some(daily.seed),
+        });
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::game_plugin::GamePlugin;
+    use crate::progress_plugin::ProgressPlugin;
+    use crate::table_plugin::TablePlugin;
+    use solitaire_core::game_state::{DrawMode, GameState};
+
+    fn headless_app() -> App {
+        let mut app = App::new();
+        app.add_plugins(MinimalPlugins)
+            .add_plugins(GamePlugin)
+            .add_plugins(TablePlugin)
+            .add_plugins(ProgressPlugin::headless())
+            .add_plugins(DailyChallengePlugin);
+        app.init_resource::<ButtonInput<KeyCode>>();
+        app.update();
+        app
+    }
+
+    #[test]
+    fn resource_uses_today() {
+        let app = headless_app();
+        let r = app.world().resource::<DailyChallengeResource>();
+        assert_eq!(r.date, Local::now().date_naive());
+        assert_eq!(r.seed, daily_seed_for(r.date));
+    }
+
+    #[test]
+    fn winning_with_daily_seed_completes_and_fires_event() {
+        let mut app = headless_app();
+        let daily_seed = app.world().resource::<DailyChallengeResource>().seed;
+
+        // Replace the GameState with one whose seed matches the daily seed.
+        app.world_mut().resource_mut::<GameStateResource>().0 =
+            GameState::new(daily_seed, DrawMode::DrawOne);
+
+        app.world_mut().send_event(GameWonEvent {
+            score: 500,
+            time_seconds: 200,
+        });
+        app.update();
+
+        let progress = &app.world().resource::<ProgressResource>().0;
+        assert_eq!(progress.daily_challenge_streak, 1);
+        // +100 from the daily bonus
+        assert!(progress.total_xp >= DAILY_BONUS_XP);
+
+        let events = app.world().resource::<Events<DailyChallengeCompletedEvent>>();
+        let mut cursor = events.get_cursor();
+        let fired: Vec<_> = cursor.read(events).copied().collect();
+        assert_eq!(fired.len(), 1);
+        assert_eq!(fired[0].streak, 1);
+    }
+
+    #[test]
+    fn winning_with_unrelated_seed_does_not_complete_daily() {
+        let mut app = headless_app();
+        let daily_seed = app.world().resource::<DailyChallengeResource>().seed;
+        // Use a deliberately different seed.
+        app.world_mut().resource_mut::<GameStateResource>().0 =
+            GameState::new(daily_seed.wrapping_add(7777), DrawMode::DrawOne);
+
+        app.world_mut().send_event(GameWonEvent {
+            score: 500,
+            time_seconds: 200,
+        });
+        app.update();
+
+        let progress = &app.world().resource::<ProgressResource>().0;
+        assert_eq!(progress.daily_challenge_streak, 0);
+
+        let events = app.world().resource::<Events<DailyChallengeCompletedEvent>>();
+        let mut cursor = events.get_cursor();
+        assert!(cursor.read(events).next().is_none());
+    }
+
+    #[test]
+    fn second_win_same_day_is_idempotent() {
+        let mut app = headless_app();
+        let daily_seed = app.world().resource::<DailyChallengeResource>().seed;
+        app.world_mut().resource_mut::<GameStateResource>().0 =
+            GameState::new(daily_seed, DrawMode::DrawOne);
+
+        app.world_mut().send_event(GameWonEvent {
+            score: 500,
+            time_seconds: 200,
+        });
+        app.update();
+        // Re-send win.
+        app.world_mut().send_event(GameWonEvent {
+            score: 500,
+            time_seconds: 200,
+        });
+        app.update();
+
+        let progress = &app.world().resource::<ProgressResource>().0;
+        assert_eq!(progress.daily_challenge_streak, 1, "streak does not double-count");
+    }
+
+    #[test]
+    fn pressing_c_fires_new_game_with_daily_seed() {
+        let mut app = headless_app();
+        let daily_seed = app.world().resource::<DailyChallengeResource>().seed;
+
+        app.world_mut()
+            .resource_mut::<ButtonInput<KeyCode>>()
+            .press(KeyCode::KeyC);
+        app.update();
+
+        let events = app.world().resource::<Events<NewGameRequestEvent>>();
+        let mut cursor = events.get_cursor();
+        let fired: Vec<_> = cursor.read(events).copied().collect();
+        assert_eq!(fired.len(), 1);
+        assert_eq!(fired[0].seed, Some(daily_seed));
+    }
+}
diff --git a/solitaire_engine/src/lib.rs b/solitaire_engine/src/lib.rs
index 0daada5..2df91dd 100644
--- a/solitaire_engine/src/lib.rs
+++ b/solitaire_engine/src/lib.rs
@@ -3,6 +3,7 @@
 pub mod achievement_plugin;
 pub mod animation_plugin;
 pub mod card_plugin;
+pub mod daily_challenge_plugin;
 pub mod events;
 pub mod game_plugin;
 pub mod input_plugin;
@@ -13,6 +14,9 @@ pub mod stats_plugin;
 pub mod table_plugin;
 
 pub use achievement_plugin::{AchievementPlugin, AchievementsResource};
+pub use daily_challenge_plugin::{
+    DailyChallengeCompletedEvent, DailyChallengePlugin, DailyChallengeResource,
+};
 pub use progress_plugin::{LevelUpEvent, ProgressPlugin, ProgressResource, ProgressUpdate};
 pub use animation_plugin::{AnimationPlugin, CardAnim};
 pub use card_plugin::{CardEntity, CardLabel, CardPlugin};