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• Alternate costumes

Successfully complete Story mode with any character to unlock an alternate costume for that person.

• Play as Chicken

Successfully complete Story mode with all characters and accumulate 10 hours of game play time to unlock Chicken.

• Play as Nerglings

Successfully complete Story mode with all characters to unlock Nerglings.

• Play as Vikings

Successfully complete Story mode with all characters and destroy every letter in the credits sequence to unlock Vikings.

• Unlock Eris

Beat Story Mode once with either Billy, Mandy, Grim, Or Irwin.

• Unlock Fred Fredburger

Beat Story Mode once with either Billy, Mandy, Grim, Or Irwin.

• Unlock Hoss Delgado

Beat Mission 9 in Tier 1 in Mission Mode.

• Unlock Mogar

Beat Story Mode once with either Billy, Mandy, Grim, Or Irwin.

• Unlock Nergal

Beat Story Mode once with either Billy, Mandy, Grim, Or Irwin.

• More Cheat Codes for Grim Adventures of Billy & Mandy, The!

More Grim Adventures of Billy & Mandy, The Cheat Codes @ CheatListings
More Grim Adventures of Billy & Mandy, The Cheat Codes @ AbsolutCheats