Logic Games For Teens: Number Ball Logic Puzzles with Answers - Paperback
by Robert Lorens (Author)
Suguru ("Number Blocks") is a logic puzzle invented by Naoki Inaba (Japan). 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.
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