🧠Cerebite

15 Puzzle

Slide tiles into the empty space until the numbers run in order, with the blank at the bottom right.

Size
Moves 0 Time 0:00

How to play

Tap any tile next to the empty space to slide it in — on a keyboard the arrow keys slide tiles too. Arrange the numbers left-to-right, top-to-bottom, ending with the blank in the bottom-right corner. Every shuffle is produced by sliding tiles backwards from the solved position, so it is always solvable — no impossible boards. The timer starts on your first move; finish fast to climb the leaderboard for your board size.

More to try

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Othello (Reversi)

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Tic-Tac-Toe

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Connect Four

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Sudoku (play & print)

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Minesweeper

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Nonogram (Picross)

Frequently asked questions

Can a shuffle ever be unsolvable?
No. Half of all random tile arrangements are mathematically unsolvable, so this game never places tiles at random — it starts from the solved board and slides tiles backwards hundreds of times. Anything reached by legal moves can always be solved by legal moves.
Any tips for solving faster?
Solve row by row: finish the top row first, then the next, without breaking completed rows. For the last two rows, work column by column from the left, placing the two tiles of each column together. The final 2×2 corner then resolves with a simple rotation.
What is a good time for the 4×4?
Casual players typically finish a 4×4 in 2–5 minutes. Under a minute is genuinely fast, and speedsolvers who practice finger tricks can go under 30 seconds. Beating your own best time is the most satisfying benchmark.