Grim Adventures of Billy & Mandy cheats and cheat codes for Nintendo Wii

Unlock Boogey as playable character:
Finish Mission 9 in Tier 4 in Mission mode. 

Unlock Dracula as playable character:
Finish Mission 5 in Tier 3 in Mission mode. 

Unlock General Skarr as playable character:
Finish Mission 6 in Tier 4 in Mission mode. 

Unlock Hoss Delgado as playable character:
Finish Mission 9 in Tier 1 in Mission mode.

Unlock Jack O'Lantern as playable character:
Finish Mission 9 in Tier 2 in Mission mode. 

Unlock Lord Pain as playable character:
Finish Mission 9 in Tier 5 in Mission mode. 

Unlock Nergal Jr. as playable character:
Finish Mission 9 in Tier 3 in Mission mode. 

Unlock Eris as playable character:
Finish Story mode as Billy, Mandy, Grim, or Irwin. 

Unlock Fred Fredburger as playable character:
Finish Story mode as Billy, Mandy, Grim, or Irwin 

Unlock Mogar as playable character:
Finish Story mode as Billy, Mandy, Grim, or Irwin. 

Unlock Nergal as playable character:
Finish Story mode as Billy, Mandy, Grim, or Irwin. 

Unlock Nerglings as playable character:
Finish Story mode as all characters. 

Unlock Chicken as playable character:
Finish Story mode as all characters and accumulate at least ten hours 
of game play. 

Unlock Vikings as playable character:
Finish Story mode as all characters and destroy every letter 
in the credits sequence. 

Alternate suits:
Finish Story mode with any character to unlock an alternate 
suit for that person.