Fifteen Slide

Fifteen Slide is the classic sliding number puzzle drawn as a set of chunky 3D blocks. Fifteen numbered pieces sit in a 4x4 frame with one empty space, and you shuffle them back into order one slide at a time.

Alexander Bazhanov made this open-source version, and it plays in any browser tab on a computer or phone. A scoreboard keeps your best results, so there is always a smaller move count to aim for.

How to play Fifteen Slide

Choosing Play starts a brief countdown, and the blocks get scrambled while the numbers tick down. Only a block that touches the gap can move. Click or tap it and it slides into the empty space, leaving a new gap behind.

Keep sliding until the numbers read 1 to 15 from the top left, row by row, leaving the empty square last, in the lower right. The game counts every move and times the whole solve, so a careful plan beats fast, random clicking.

When you finish, type a nickname and save the result to the scoreboard. Entries are ranked by fewest moves, and each one also shows the time it took.

Controls

Tips

• Solve the top row first, then the second row, and leave the bottom two rows for the end. Once a row is done, try not to disturb it.
• Place the last two pieces of a row together. Park the final number below its spot, then bring the other one in and rotate both into place.
• Finish the last two rows column by column from the left, pairing 9 with 13, then 10 with 14.
• With the arrow keys, the block next to the gap moves in the arrow's direction. Practice a few slides so you do not mix up which way it goes.
• If the tilt makes numbers hard to read, drag across the board with the mouse to turn it to a better angle.

If you like Fifteen Slide, try these

• 
  2048

  Sliding tiles with a number goal again, though every swipe moves the whole 4x4 board at once.

• 
  Tangram

  Spatial thinking without numbers, turning and flipping seven pieces to fill a silhouette.

Questions

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