English Heyawake Cited by user 84.58.251.50 on 04 May 2009 Heyawake (Japanese: へやわけ, "divided rooms") is a binary-determination logic puzzle published by Nikoli.
English List of NP-complete problems Cited by user 84.58.251.50 on 04 May 2009 This is a list of some of the more commonly known problems that are NP-complete when expressed as decision problems.