A relaxing brain workout
Logic, not luck
Every puzzle has one unique solution you can reach by reasoning alone. No lucky guesses required.
Difficulty that grows
Progress through hand-tuned stages, from gentle warm-ups to genuinely brain-bending challenges.
Clean & calm
A modern, distraction-free board with no timers. Solve at your own pace, the relaxing way.
Helpful hints
Stuck on a tricky square? Tap the Hint button for a nudge in the right direction.
How to play
- Fill the grid with numbers.
- Each colored region must contain the numbers 1 up to the region's size, with no repeats.
- No two touching cells can share the same number — including diagonals.