We have cheats for this game on PlayStation, PlayStation 2, and sometimes cheats from other systems may work on the PlayStation 2 version.
Checkmate Cheats & Codes
At the title screen, press Left, Up(2), Right(3) to select a bonus character in
versus mode. For a second bonus character, unlock the first bonus character, then
press L1(3), R1(3) at the title screen.
Want even more Checkmate Cheats?
We have Checkmate cheats for PlayStation and PlayStation 2 on CheatCodes.com. Give them a try, since cheats for other game systems sometimes work on PlayStation 2 games, too!