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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


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[edit]

The problem of finding a solution to a particular Tatamibari configuration is NP-complete.[2]

See also[edit]


  1. ^ "Tatamibari rules and example". Retrieved May 16, 2011.
  2. ^ Adler, Aviv; Bosboom, Jeffrey; Demaine, Erik D.; Demaine, Martin L.; Liu, Quanquan C.; Lynch, Jayson (7 May 2020). "Tatamibari is NP-complete". arXiv:2003.08331 [cs.CC].