In the extras menu under cheats, then choosing "Enter cheat code" and entering.

Password	Effect
118147	Unlimited lobber goo.
313456	Invulnerbility.
456645	Damage boost.
654168	Unlocks Mr. Huggles for play.
691427	Unlocks Exo-Huggles 9000 for play.
854511	Unlimited splitter goo.
971238	Unlimited scatter goo.