Mini-games:
Unlock the following mini games by performing the corresponding tasks:
Ayame’s Shuriken mini-game – Get 500 medals in a mini-game
Gunrock’s Slot mini-game – Get 1,000 medals in a mini-game
Unlockable Characters:
Unlock the following characters by performing the corresponding tasks:
Pete in Power Stone – Beat the original Power Stone
Julia in Power Stone – Beat the original Power Stone with Pete
Gourmond in Power Stone – Beat the original Power Stone with Julia
Accel in Power Stone – Beat the original Power Stone with Gourmond
Kraken in Power Stone – Beat the original Power Stone with all characters
Valgas in Power Stone – Beat the original Power Stone with Kraken
Final Form Valgas in Power Stone – Beat the original Power Stone with Valgas
Pride and Kraken in Power Stone 2 – Beat 1-On-3 mode with Falcon in Power Stone 2
Valgas in Power Stone 2 – Beat 1-On-3 mode with Kraken in Power Stone 2
Mel in Power Stone 2 – Beat 1-On-3 mode with Pride in Power Stone 2
Bonus weapons in Power Stone:
Beat the original Power Stone to unlock the Machine Gun, Nyoi-Bo, Power Shield, and Ray Gun.
Bonus weapons:
Unlock the following weapons by beating either game with the corresponding characters. Note: Pete, Gourmand, Julia, and Accel do not unlock items in the first Power Stone:
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