Pentomino
There are exactly 12 ways to join five squares edge to edge, counting rotations and flips as the same. Use all 12 to fill the board with no gaps.
- Placed
- 0 / 12
- Time
- 0:00
How to play
- Pick a piece, then tap the board to place it — or drag it there.
- Use Rotate and Flip to turn it. Tapping the held piece again also rotates it.
- Tap a placed piece to pick it up, or drag it somewhere else.
- With a keyboard: focus the board, move with the arrow keys, R rotates, F flips, Enter places.
- Depending on your screen, the board may be shown turned on its side — it’s the same puzzle.
Learn more
“Watch the computer” uses backtracking: it fills the first empty square with each piece that fits and backs up when it gets stuck. The solution counts shown for each board were checked by running this same program over every possibility.