Sinkstone

Sinkstone is a crypt-floor logic puzzle. Each stone carries a weight. Tap a stone, then an orthogonal neighbour: equal weights cancel, and a heavier stone sinks in and leaves only the difference. A wrong sink can isolate a lone stone with nowhere to go. Five floors, from a single pair to a 3×3 gate.

Controls: Tap a stone, then tap an orthogonal neighbour that is equal or lighter. Tap Undo, Restart or Next as needed. Desktop clicks mirror taps.

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