War of the Monsters is a 3D fighting game for the PlayStation 2 developed by Incognito Entertainment and published by Sony Computer Entertainment. The game was released on January 14, 2003 in North America and April 17, 2003 in Europe. It was later released in Japan on March 25, 2004. 
The game is set in the aftermath of an alien invasion of Earth where their hazardous fuels have spawned giant monsters that battle one another in city environments. The game pays homage to Kaiju and 1950s Science fiction films.
It is now available on the PlayStation Network as a PlayStation 2 classic.