How to Play
Color every circle black or white. Two simple rules lead to one unique solution.
- 1One black per region. Each outlined region must contain exactly one black circle. All other circles in that region are white.
- 2No three in a line. Never place three circles of the same color consecutively in any row, column, or diagonal. An empty cell breaks the line.
Tap an uncolored circle to cycle: grey → black → white → grey. Use Undo, Hint, Check, and Reset any time.
Black (filled)
White (hollow)
Uncolored