500 Credits
Pause game play, then press [Right], [Left], [Right], [Left], [L], [R], [Up]x2, [R]x2, [L]x2. Note: This can only be done once per game, but can be combined with the other codes that have a similar effect.
1000 Credits
Pause game play, then press [Up], [Down], [Up], [Down], [Left], [Right], [L], [R], [L], [R]x2, [L]. Note: This can only be done once per game, but can be combined with the other codes that have a similar effect.
5000 Credits
Pause game play, then press [Up], [Right], [Down], [Left], [L]x2, [Right], [Left], [R]x2, [L]x2. Note: This can only be done once per game, but can be combined with the other codes that have a similar effect.
Castle 3 multi-player level
Successfully complete the Abominable Snow Turtle (level 3).
Single Pak 3 multi-player level
Successfully complete the King Of The Chameleon (level 1).
Single Pak 4 multi-player level
Successfully complete Saurian General (level 2).
Wasteland 1 multi-player level
Successfully complete the Giant Mech Turtle (level 4).
Wasteland 2 multi-player level
Successfully complete Dark "Devan" Shell (level 5).