A 5×5 board holds six colours, four tiles each, and one empty space. Slide the tiles next to the gap, one at a time, until the centre 3×3 matches the pattern. The outer sixteen squares can be any colour. Solo, your time goes on the national best. Online, everyone gets the same board and pattern at the same moment, and first to three rounds wins.
| Players | 1 to 6 |
|---|---|
| Format | Time race |
| On your own | Solo, on the national best |
| Length | 20-60 seconds a puzzle · first to three, 3-5 minutes |
| Price | Free · no sign-up · no install |

A paper slip shows a 3×3 colour pattern. That is the target. The board is different every time, and everyone in a room gets the same board and the same pattern.
Only tiles directly above, below, left or right of the empty space can move. Tap one and it slides into the gap. On a computer the arrow keys work too.
The moment the nine centre squares match the pattern, you are done. The outer ring does not matter. The screen shows how many of the nine are right, so you always know how close you are.
Solo, your time goes against the national top five. Online, the first to finish takes the round, and first to three rounds wins. A round lasts 120 seconds at most; if nobody finishes, it is void and the next one starts.
One to six. Solo, your time goes on the national best. With friends, create a room and send the four-letter code; whoever enters it lands on the same board.
Yes. It runs in any browser on a phone, tablet or computer. It is free, with no sign-up and nothing to install. On a computer the arrow keys work too.
No. Only the centre 3×3 is checked. The sixteen squares around it can be any colour.
Yes. Everyone in the room gets an identical board and pattern and starts at the same moment, so there is no luck in it — only speed.