Yin Yang Stones
Fill the board with black and white stones so each colour forms a single connected group and no 2x2 square is all one colour. Ribbons show when a colour is whole. Thirty puzzles from 6x6 to 9x9.
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Controls
Tap- Tap a cell: black, again: white, again: clear.
- All black stones must touch as one group, all white stones too, and no 2x2 block may be all black or all white.
About the game
Yin Yang Stones is a quiet logic puzzle built on balance. Every cell of the board must hold a stone, either black or white. All the black stones have to form one single group connected side to side, and so do all the white stones. On top of that, no 2x2 square may be filled with only one colour. A few stones are placed for you, and from those alone the whole board can be worked out.
Two hidden rules help a lot once you notice them: a 2x2 square can never be a checkerboard, and the colours around the outer edge can only change twice, otherwise one colour would be cut in two. The twist is the ribbons. Neighbouring stones of the same colour are tied with a thin thread, and as soon as a colour becomes one whole group, its thread turns into a glowing ribbon that flows around the board, so you can see at a glance which colour is still split. Thirty puzzles grow from 6x6 to 9x9, each with exactly one answer.
Free to play in your browser. No download, no sign-up. Works on phones, tablets and computers. Your progress is saved on this device.