Wrath Unleashed 
  
Xbox
  

Double health/speed in Vs. Mode:


At the title screen, press Down, Down, Up, Down, Left, Right, Down, Up, Up, Up,
Up, Right, Left, X.
 Extra Vs. Mode characters:


  At the character select screen, press L, L, Down, Down, Black, White, Black,
  White, R, L, Black, R, R, White. 
 Big characters at world map:


   At the title screen, press Left, X, Up, Y, Right, B,
  Down, B.
Vs. Mode Elephant Pool Arena:


Win 20 team battles.

Vs. Mode Metal Age Arena:


Win 100 arena battles. 


Thanks to Revolution readers chipperdan and eegloo!