The Unholy War Cheats

Unlock Beta Razor-fane and Super-Prana Devil:
Pick mayhem mode, then highlight the SET TEAMS option. Push and release Circle + Square. Then push Select(4), Start(3), Square(2), Circle, Circle + Square. Beta Razor-fane and Super-Prana Devil will now be available for selection.

Bonus maps:
Pick mayhem mode, then highlight the ACCEPT TEAMS option. Push and release Circle + Square. Then push Select(4), Start(3), Square(2), Circle, Circle + Square. The Maze and Menhir Circle will now be available for selection.

Single player map select:
Pick strategy mode, then highlight the SET WAR option. Push Circle + Square. Then push Select(4), Start(3), Square(2), Circle, Circle + Square. Any single player map may be selected for game play.