Jeff Heldt

Japanese Puzzle: Seismic Puzzles - The Best Puzzles Collection - Brain Teaser Books Jeff Heldt

Seismic is a logic puzzle published by Nikoli. The puzzle consists of a rectangular grid of any size divided into polyomino sections called "rooms". Each room must be filled with each of the numbers from 1 to the number of cells in the room. If two identical numbers appear in the same row or column, at least that many cells with other numbers must separate them.

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