Tatamibari () is a type of logic puzzle designed and published by Nikoli. The puzzle is based on Japanese tatami mats.

Rules A Tatamibari puzzle is played on a rectangular grid with three different kinds of symbols in it: +, -. and |. The solver must partition the grid into rectangular or square regions according to the following rules:

Every partition must contain exactly one symbol in it. A + symbol must be contained in a square. A | symbol must be contained in a rectangle with a greater height than width. A - symbol must be contained in a rectangle with a greater width than height. Four pieces may never share the same corner.

Computational complexity

The problem of finding a solution to a particular Tatamibari configuration is NP-complete.

See also List of Nikoli puzzle types

References