Battle Stadium D.O.N (PlayStation 2)
CheatingDome.com
All Characters
On the main menu screen, input: UP, DOWN, DOWN, SQUARE, CIRCLE, DOWN, TRIANGLE, R3 + L3 (simultaneously)
Gallery
Clear the game once with anyone.
More Difficulties
Unlock Hard, Very Hard, and Time Attack modes by completing the game on Normal, Hard, and Very Hard (respectively).