Usowan (Usoone)

Game Rules: Shade cells so each room has exactly one incorrect number. Every other number counts orthogonally adjacent black cells. Number cells stay white, black cells cannot share edges, and all white cells remain connected. Tap to shade or erase; hold to mark white or clear the mark. Drag to paint the same state.

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Game Rules: Usowan

Shade cells so exactly one clue per room gives the wrong count of adjacent black cells. Black cells cannot touch by a side, and white cells stay connected.

Shade cells so each room has exactly one incorrect number. Every other number counts orthogonally adjacent black cells. Number cells stay white, black cells cannot share edges, and all white cells remain connected. Tap to shade or erase; hold to mark white or clear the mark. Drag to paint the same state.

Frequently Asked Questions

How can I start solving Usowan?

If a clue already touches too many black cells, it is the room's false clue. Every other number in that room must now be exact.

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