The creators of Street Fighter add a new dimension to 3D fighting. In Power Stone, two fighters take to multi-level arenas with Power Stones and other weapons lying around for use.
Each game contains Power Stones. When you have enough stones (between three to five), your character transforms into an almost unbeatable warrior, with an all-new range of moves (although this does not last for long).
In Japan, an OVA (original video anime) based on the Power Stone story and cast was released, which is basically the same story as the game: everyone is out to find the Power Stones for their personal wishes. The anime is quite enjoyable and is recommended if you can find it.