Obitaru 環帯

Draw a rectangular belt around every black stone. Each belt rings exactly one stone, every white stone must lie on a belt, and belts may cross only at right angles — never two running the same way through one cell. A stone's number counts the white stones its belt passes through.

Three modes: Classic; Square, where every belt must be a perfect square rather than any rectangle; and Chain, where every belt must cross another and all of them link into a single chain.

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Obitaru 環帯 — Belts Around Stones