The Big Book of Logic Puzzles - Sujikai 400 Hard (Volume 20) by Mykola Krylov
21,41 €
Sujiken (from Japanese "sujikai," literally "diagonal") is a variation of Sudoku, invented by George Heineman (USA). The puzzle consists of a triangular grid of cells containing digits from 1 to 9. The objective is to fill a grid with digits so that each cell contains a digit and no digit is repeated in any column, row and diagonal in any direction. Also, no digit occurs twice in any of the three larger 3 x 3 square regions and any of the three larger triangular regions enclosed by thick borders.
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