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Islands and Sea

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Choose a level to use the original printable artwork. Optional replacement artwork uses the shared image editor. Preparing tools or sturdy cards belongs with an adult.

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Include separate answer key

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Shade one side-connected sea around white islands. Each island contains exactly one clue and has that many cells; islands cannot share a side, and the sea cannot contain a solid two-by-two block. A complete legal miniature contrasts a crossed-out sea block. Starter uses three-by-three; Growing uses four-by-four. Both original boards have a unique shading. The separate key shades the sea. Demonstrate the rules before independent use.

Suggested ages 9–12 · connected regions

Activity references

Nikoli Nurikabe