Logic Grid Puzzles: Toichika Puzzles - 200 Logic Grid Puzzles With Answers (Warner Ted)(Paperback)

Toichika is a logic puzzle published by Nikoli. The task consists of a rectangular or square grid divided into regions. The goal is to place arrows in some cells according to the following rules:
- Each region contains exactly one arrow.
- Each two arrows are paired, they point to each other. There are no unpaired arrows.
- Two regions with paired arrows must not be horizontally or vertically adjacent.
- Between two paired arrows, no other arrow must be
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