Rat Attack! is an arcade-style puzzle game for the Nintendo 64 and PlayStation. It was first released on the PlayStation in 1999, and later on the Nintendo 64 in 2000 (the latter console version originally had a slated May 1999 release date in Europe before it was delayed); it was later ported to Microsoft Windows in July 2007 in the UK. Its theme is about a group of 'Scratch Cats' stopping an invasion of 'evil mutant space rats'. It received mixed reviews after its several years in development. The game was slightly altered for its Nintendo 64 release, switching out one of the characters and changing a series of levels.