Yin-Yang puzzle rules

Fill every cell. Keep dark cells connected to dark, and light cells connected to light. Never make a solid 2 × 2 square.

One rule at a time

1. Join every dark cell into one group through shared edges. A corner touch does not connect cells.
2. Join every light cell into its own edge-connected group. Keep the given circles unchanged.
3. No 2 × 2 block may contain four dark cells or four light cells. Both colors must stay connected when the board is full.

A useful first deduction

If three cells in a 2 × 2 block are dark, the fourth must be light. The same deduction works with three light cells.

Mark a board

Tap to cycle dark → light → clear. Arrow keys move; D marks dark, L marks light, Backspace clears.

Use the buttons below the board to mark its selected cell or connection. Undo removes your last move. Restart clears only the board you are playing, after confirmation.

When a board is finished

Fill all cells. The game checks the clues, forbidden patterns and connected areas. A conflict message points out a rule that cannot be satisfied. Completing the board opens the next puzzle action.

Hints and daily puzzles

A hint points to one forced move and explains the deduction. Apply it only when you are ready. If your marks leave no valid completion, undo an uncertain move first. Daily boards use a separate original set and stay fixed for the UTC day. Return to a past saved daily board until you choose today’s board.

Puzzle Yin-Yang · rules. PuzzHive’s boards, interface and artwork are original; no puzzle from this reference is reproduced.