Rock 'em Sock 'em Robots Arena cheats, and Codes for PSX.
Fight as Old Blue:
To play as the original blue robot, win career mode as the Blue Bomber.
Fight as Old Red:
To play as the original red robot, win career mode as the Red Rocker.
Fight as Tywrenchula:
Win career mode as Stakeout.
Fight as Ben Hurt:
Win the career mode as Slamuri.
Fight as Sir Haxalot:
Win career mode as Head Case.
Hint: Extra arms and legs:
Start a match in career mode and keep hitting your opponent's arms or legs until that piece falls off.