In Nikoli no Sudoku +2 Daiisshuu - Sudoku Nurikabe Heyawake, Sudoku is a logic-based, combinatorial number-placement puzzle. Nurikabe is a binary determination puzzle named for Nurikabe, an invisible wall in Japanese folklore that blocks roads and delays foot travel. Heyawake is a binary-determination logic puzzle published by Nikoli. As of 2013, five books consisting entirely of Heyawake puzzles have been published by Nikoli.
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