Tip:
If you have a PlayStation mouse, use it for this game. Tip: Be sure to run through the single-player game first to get a feel for the gameplay. It's hard enough for two or more experienced players to play a multiplayer game, let alone to learn the game. Tip: Keep an eye on the furniture and items that you need to protect. Don't get distracted by all the little rats running around, or your game's over.

Bonus characters
Successfully complete the game in normal mode. The scratch cats Atomicat and Pearl will be unlocked in multi-player and one player modes.

Unlock Female Cat
Complete the game

Unlock Super Male Cat
Beat The Game

Unlock stuff
This is entered as player names. You can then enter another name

Code - Result:

wholetthecatsout - ALl Levels Unlocked
whyisspikehere - Extra Level
allthecheese - Final Level
tombeatsjerry - Unlock all cats