Suguru ("Number Blocks") is a logic puzzle invented by Naoki Inaba (Japan) that has simple rules, but which provides sufficient challenges to satisfy the most enthusiastic solvers . The task consists of a rectangular or square grid divided into regions. Each region must be filled with each of the digits from 1 to the number of cells in the region. Cells with the same digits must not be orthogonally or diagonally adjacent. Even though the rules are...
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