Chainsaw Maniac was a browser-based game made to promote the PlayStation 2 release of Resident Evil 4.

Chainsaw Manaic involved moving left and right into incoming chainsaw Ganado to defeat them in in Nintendo "Game & Watch" styled graphics.

Two competitions were also held where players could win a copy of Resident Evil 4 for PlayStation 2, a PlayStation 2 Chainsaw Controller, or a T-shirt designed for the competition.