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