42 Secrets
If you insert your game CD into a PC and upen up the datahints folder, there will be 42 text files filled with cheats, tips, and hints!
Jumping Down the Stairs
While you are in the house, get to the top of the stairs and make sure your facing down the stairs. Now you should be able to jump the whole stair case and it wont even hurt Tommy. Not much of a code, but its fun and saves a bit of time.
Play On Playground Equipment
Go to the game Grandpas teeth "medium". If you press Circle next to the playground equipment you will see a small movie of the Rugrats playing on the equipment.
Play the piano
Go to the living room and there you will find a small purple piano. Go up to the front where you see the keys and press circle.
Play with Spike
You can play fetch with Spike outdoors by picking up the small ball, the bone, and the stick.
Secret Level
Get 13 or more Reptar bars and you will gain a secret level after you beat the game, in which you are Reptar.
Shortcut in "Incident, Isle 7"
On Incident, Isle 7, when you go where the plants are, there will be three balloons tied together. Run into them and press CIRCLE. This will bring you to the middle part of the board.