15 Puzzle: Sliding Numbers

Slide numbered tiles into order, using just one empty space. Begin with 40 small 3 × 3 sliding number puzzles, then continue through 80 classic 4 × 4 fifteen puzzles. Every starting position is produced by legal moves from the finished board, so every puzzle can be completed. Correctly placed tiles get a gentle color cue. There is no countdown or move limit.

PLAY AT YOUR OWN PACE
• All 120 puzzles are available from the start.
• Offline play with no account or internet connection needed.
• Undo moves, restart a board, or choose another puzzle.
• Progress and settings are saved on this device.
• Zoom for a closer view of the board.
• Optional soft sounds, dark surroundings and larger interface text.
• No in-app purchases.

HOW TO PLAY
1. Slide a numbered tile into the adjacent empty space.
2. Arrange the numbers from left to right, top to bottom, with the empty space last.
3. Begin with 3 × 3 boards, then explore classic 4 × 4 puzzles. Undo and guided route hints are available.

WHEN YOU WANT A LITTLE HELP
Guided hints show the next move on the saved solution route. If you choose a different route, undo or restart to return to that guidance; any valid finish still wins.

PRIVACY
No account is required. Uninstalling or clearing app data removes locally saved progress.

Made by Gemduck. Support: hello@gemduck.com

Play every puzzle offline, with free hints and undo. Android includes occasional ads after completed puzzles and optional rewarded quiet play. Statistics default to on after you agree to the entry-screen User Agreement and Privacy Policy. You can turn them off on the entry screen or in Settings; saved choices are kept. Ten interface languages are available in Settings. No in-app purchases. Progress stays on this device.

Recent changes:
A simpler welcome screen: no checkboxes and no scrolling to start. Tap once to agree and play. Read the User Agreement and Privacy Policy through their links. Statistics start after agreement, are on by default for new players, and can be switched off in Settings. Existing choices are kept.