Get 500 medals in a mini-game to unlock the Ayame's Shuriken mini-game.
Get 1,000 medals in a mini-game to unlock the Gunrock's Slot mini-game.
Successfully complete the original Power Stone to unlock Pete.
Successfully complete the original Power Stone with Pete to unlock Julia.
Successfully complete the original Power Stone with Julia to unlock Gourmond.
Successfully complete the original Power Stone with Gourmond to unlock Accel.
Successfully complete the original Power Stone with all characters to unlock Kraken.
Successfully complete the original Power Stone with Kraken to unlock Valgas.
Successfully complete the original Power Stone with Valgas to unlock Final Form Valgas.
Successfully complete the original Power Stone to unlock the following weapons: Machine Gun, Nyoi-Bo, Power Shield, and Ray Gun.
Successfully complete 1-On-3 mode with Falcon in Power Stone 2 to unlock Pride and Kraken.
Successfully complete 1-On-3 mode with Kraken in Power Stone 2 to unlock Valgas.
Successfully complete 1-On-3 mode with Pride in Power Stone 2 to unlock Mel.
Successfully complete either game with the indicated character to unlock the corresponding weapon. Note: 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
- Crystal Ball: Rouge
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