Nurikabe is an addicting logic puzzle game with elements of Go and Minesweeper, invented by the creators of sudoku. Build a wall that divides the board into areas given by the numbers — there's only one way to do it!
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500 puzzles, 100 of each size
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Difficulty from tricky to fiendish
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An animated guide to how to play and solve
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Unlimited undo
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Subtle visual hints alert you to problems
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Game Center scoreboards and achievements
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English, German and Japanese translations
There's a Facebook page for occasional notes and news.