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Arrange all numbered tiles in order from 1 to N²−1, left to right, top to bottom, with the empty space in the bottom-right corner.
Tap any tile in the same row or column as the empty space. It — and every tile between it and the empty space — will slide over together.
Choose a grid size, then press Shuffle to scramble the tiles and begin. The puzzle is shown solved first so you know the goal.
Press Hint to auto-complete one move for you. You get 5 hints per game — use them wisely!
Press Restart to go back to the solved state and shuffle again. Press ← Menu to choose a different grid size.