Tatamibari

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

Tatamibari puzzle.

Tatamibari puzzle solved grid

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:^[1]

• 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.^[2]

See also

• List of Nikoli puzzle types