diff --git a/api/sixtyfps-rs/lib.rs b/api/sixtyfps-rs/lib.rs
index 4f76568de..9d994e85c 100644
--- a/api/sixtyfps-rs/lib.rs
+++ b/api/sixtyfps-rs/lib.rs
@@ -156,6 +156,7 @@ pub use sixtyfps_corelib::model::{
 };
 pub use sixtyfps_corelib::sharedarray::SharedArray;
 pub use sixtyfps_corelib::string::SharedString;
+pub use sixtyfps_corelib::timers::{Timer, TimerMode};
 pub use sixtyfps_corelib::{ARGBColor, Color};
 
 /// internal re_exports used by the macro generated
diff --git a/examples/slide_puzzle/README.md b/examples/slide_puzzle/README.md
index e94795153..3dcb6ce63 100644
--- a/examples/slide_puzzle/README.md
+++ b/examples/slide_puzzle/README.md
@@ -13,8 +13,9 @@ Remaining feature to implement to have parity:
    Seatle). Note that this feature is kind of broken in the flutter example as it is only applied
    when changing themes
  * Expanding cirle animation when pressing a tile.
- * Auto-play mode. Including animation of the auto-play checkbox
+ * Animation of the auto-play checkbox.
  * When the puzzle is finished, the last tile is added, and the tiles are growing in the Seatle theme,
    or a hand apears, and the puzzle cannot be moved.
  * The different styles are well separated in different files.
+ * Shadow on the tiles
 
diff --git a/examples/slide_puzzle/main.rs b/examples/slide_puzzle/main.rs
index 16b69d41b..eac3eef94 100644
--- a/examples/slide_puzzle/main.rs
+++ b/examples/slide_puzzle/main.rs
@@ -48,6 +48,7 @@ struct AppState {
     /// An array of 16 values wixh represent a 4x4 matrix containing the piece number in that
     /// position. -1 is no piece.
     positions: Vec<i8>,
+    auto_play_timer: sixtyfps::Timer,
 }
 
 impl AppState {
@@ -99,6 +100,24 @@ impl AppState {
             self.set_pieces_pos(self.positions[swap as usize] as _, swap);
         }
     }
+
+    fn random_move(&mut self) {
+        let mut rng = rand::thread_rng();
+        let hole = self.positions.iter().position(|x| *x == -1).unwrap() as i8;
+        let mut p;
+        loop {
+            p = rand::Rng::gen_range(&mut rng, 0, 16);
+            if hole == p {
+                continue;
+            } else if hole % 4 == p % 4 {
+                break;
+            } else if hole / 4 == p / 4 {
+                break;
+            }
+        }
+        let p = self.positions[p as usize];
+        self.piece_clicked(p)
+    }
 }
 
 #[cfg_attr(target_arch = "wasm32", wasm_bindgen(start))]
@@ -113,12 +132,34 @@ pub fn main() {
         pieces: Rc::new(sixtyfps::VecModel::<Piece>::from(vec![Piece::default(); 15])),
         main_window: main_window.as_weak(),
         positions: vec![],
+        auto_play_timer: Default::default(),
     }));
     state.borrow_mut().randomize();
     main_window.as_ref().set_pieces(sixtyfps::ModelHandle::new(state.borrow().pieces.clone()));
     let state_copy = state.clone();
-    main_window.as_ref().on_piece_cliked(move |p| state_copy.borrow_mut().piece_clicked(p as i8));
+    main_window.as_ref().on_piece_cliked(move |p| {
+        state_copy.borrow().auto_play_timer.stop();
+        state_copy.borrow().main_window.upgrade().map(|x| x.as_ref().set_auto_play(false));
+        state_copy.borrow_mut().piece_clicked(p as i8);
+    });
     let state_copy = state.clone();
     main_window.as_ref().on_reset(move || state_copy.borrow_mut().randomize());
+    let state_copy = state.clone();
+    main_window.as_ref().on_enable_auto_mode(move |enabled| {
+        if enabled {
+            let state_weak = Rc::downgrade(&state_copy);
+            state_copy.borrow().auto_play_timer.start(
+                sixtyfps::TimerMode::Repeated,
+                std::time::Duration::from_millis(200),
+                Box::new(move || {
+                    if let Some(state) = state_weak.upgrade() {
+                        state.borrow_mut().random_move();
+                    }
+                }),
+            );
+        } else {
+            state_copy.borrow().auto_play_timer.stop();
+        }
+    });
     main_window.run();
 }
diff --git a/examples/slide_puzzle/slide_puzzle.60 b/examples/slide_puzzle/slide_puzzle.60
index a1e8d10f9..0efeed186 100644
--- a/examples/slide_puzzle/slide_puzzle.60
+++ b/examples/slide_puzzle/slide_puzzle.60
@@ -33,6 +33,8 @@ struct Theme := {
 export MainWindow := Window {
     signal piece_cliked(int);
     signal reset();
+    signal enable_auto_mode(bool);
+    property <bool> auto_play;
     property <int> moves;
     property <int> tiles-left;
     property <[Piece]> pieces: [
@@ -206,7 +208,7 @@ export MainWindow := Window {
                 + (parent.width - (4*pieces_size + 3*pieces_spacing))/2;
             y: px * (pieces_size + pieces_spacing)
                 + (parent.height - (4*pieces_size + 3*pieces_spacing))/2;
-            animate px , py { duration: 200ms; easing: cubic-bezier(0.17,0.76,0.4,1.9); }
+            animate px , py { duration: 170ms; easing: cubic-bezier(0.17,0.76,0.4,1.75); }
             animate border-width, border-radius { duration: 500ms; easing: ease-out; }
 
             if (current-theme-index == 1) : Rectangle {
@@ -259,6 +261,21 @@ export MainWindow := Window {
                         clicked => { root.reset(); }
                     }
                 }
+                Text {
+                    // FIXME: this should be a rectangle with an animated ✓
+                    text: auto_play ? " ☑ " : " ☐ ";
+                    color: auto_play ? current-theme.game-highlight-color : current-theme.game-text-color;
+                    animate color { duration: 200ms; }
+                    vertical-alignment: align-center;
+                    TouchArea {
+                        width: 100%;
+                        height: 100%;
+                        clicked => {
+                            auto_play = !auto_play;
+                            root.enable_auto_mode(auto_play);
+                        }
+                    }
+                }
                 Rectangle {} // stretch
                 Text {
                     text: root.moves;
diff --git a/sixtyfps_runtime/corelib/timers.rs b/sixtyfps_runtime/corelib/timers.rs
index 042ff1609..966ac93b9 100644
--- a/sixtyfps_runtime/corelib/timers.rs
+++ b/sixtyfps_runtime/corelib/timers.rs
@@ -19,6 +19,8 @@ use std::cell::{Cell, RefCell};
 type TimerCallback = Box<dyn Fn()>;
 
 /// The TimerMode specifies what should happen after the timer fired.
+///
+/// Used by the [`Timer::start`] function.
 #[derive(Copy, Clone)]
 pub enum TimerMode {
     /// A SingleShot timer is fired only once.
@@ -40,7 +42,7 @@ impl Timer {
     ///
     /// Arguments:
     /// * `mode`: The timer mode to apply, i.e. whether to repeatedly fire the timer or just once.
-    /// * `duration`: The duration from now until when the fire should fire.
+    /// * `duration`: The duration from now until when the timer should fire.
     /// * `callback`: The function to call when the time has been reached or exceeded.
     pub fn start(&self, mode: TimerMode, duration: std::time::Duration, callback: TimerCallback) {
         CURRENT_TIMERS.with(|timers| {