At the "Extras" menu, select "Cheats", then enter one of the following codes to activate the corresponding cheat function:

Play as Exo-Huggles 9000 - Enter "691427" as a code to unlock Exo-Huggles 9000.
Play as Mr. Huggles - Enter "654168" as a code to unlock Mr. Huggles.
Invincibility - Enter "313456" as a code.
Damage boost - Enter "456645" as a code.
Infinite Lobber Goo - Enter "118147" as a code.
Infinite Scatter Goo - Enter "971238" as a code.
Infinite Splitter Goo - Enter "854511" as a code.

Awards - Successfully complete the indicated task to unlock the corresponding award:

Bear Buster: Defeat at least 100 Mr. Huggles.
Blokk Buster: Defeat at least 20 Blokks.
Bot Buster: Defeat at least 50 Factory Bots.

Can Opener: Defeat at least 20 Tin Robots.
Chadbot's Collector: Find all Master Models.
Circuit Breaker: Collect more then 5,000 Circuits.
Cobber!: Play as Rocko.

Eediot!: Play as Stimpy.

Girls Just Wanna Kick Butt: Play Jenny and Sam.

Honorary Fairy, Second-Class: Find all 500 Fairies.

Invader!: Play as GIR.

Kitty Champion: Find Stimpy.

Power Tour Player: Play as Jimmy and Timmy.

Robot Ranger: Find Jenny/XJ9.
Robot Reveller: Find GIR.

Team-Up Legends 1: Play as SpongeBob and Patrick.
Team-Up Legends 2: Play as Danny and Sam.
Teenager!: Play as Jenny/XJ9.
The Biggest Genius: Successfully complete the Game.

Wallaby Warrior: Find Rocko.
Wheeler Dealer: Defeat at least 30 Wheelies.