Power Stone Collection Unlockables
PSP | Submitted by GamesRadarPowerstone 2 Unlockable Characters
Mel - Beat 1 vs 3 mode with Pride
Pride and Kraken - Beat 1 vs 3 mode with Falcon.
Valgas - Beat 1 vs 3 mode with Kraken
PSP | Submitted by GamesRadarUnlock Mini Games
To unlock the two extra minigames (marked '???'), you have to start by earning medals in the first mini-game.
Ayame's Shuriken minigame - obtain at least 500 medals
Gunrock's Slot minigame - obtain at least 1000 medals
PSP | Submitted by GamesRadarPowerstone 1 Unlockable Characters
Accel - Beat the game with Gourmond
Gourmond - Beat the Game with Julia
Julia - Beat the Game with Pete
Pete - Beat the game once with any character.