Power Stone Collection Cheats 

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Bonus weapons:
Complete either game with the indicated character to unlock the corresponding weapon. REMEMBER: Pete, Gourmand, Julia and Accel do not unlock items in the first Power Stone.

Amenomurakuno: Ryoma
Crystal Ball: Rouge
Decoy Bomb: Ayame
Giant Boots: Gunrock
Maches Chainsaw: Jack
Soccer Ball: Falcon
Stone Sweeper: Julia
Thunderbolt Rider: Accel
Totem Hammer: Galuda
Turbo Helmet: Pete
Twin Potion: Wang-Tang
Wok Gun: Gourmand

Ayame's Shuriken mini game:
Get 500 or more medals in a mini-game.

Gunrock's Slot mini game:
Get 1,000 or more medals in a mini-game.

Power Stone: Play as Pete:
Finish the game.
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Power Stone: Play as Julia:
Finish the game as Pete.

Power Stone: Play as Gourmond:
Finish the game as Julia.

Power Stone: Play as Accel:
Finish the game as Gourmond.

Power Stone: Play as Final Form Valgas:
Complete the game as Valgas.

Power Stone: Play as Kraken:
Complete the game with all characters except those from the PlayStation2 version.

Power Stone: Play as Valgas:
Complete the game with Kraken.

Power Stone: Bonus weapons:
After finishing the game you will unlock the following weapons: Machine Gun, Nyoi-Bo, Power Shield, and Ray Gun.

Power Stone 2: Play as Pride and Kraken:
Complete 1-on-3 mode as Falcon.

Power Stone 2: Play as Valgas:
Complete 1-on-3 mode as Kraken.

Power Stone 2: Play as Mel:
Complete 1-on-3 mode as Pride.

Power Stone Collection Official Website