Power Stone is an outrageous beat-'em-up style game where players go head to head against an opponent in best of three round match ups. Arcade mode allows a single character to put their skills to the test against a lineup of computer controlled opponents. Unlimited continues are available and successfully defeating all enemies will unlock a variety of bonus features in the "Power Stone Collection" including weapons, characters, galleries, additional modes and more. In Versus mode, two players pick their character of choice and battle it out. The PSP system edition includes an improved user interface which features a new, easy to see horizontal health meter as well as arrows on the radar to represent the location of the power stones. As an added bonus, the four additional characters from Power Stone 2 have been made available for Power Stone, bringing the total to 15 playable characters.