Power Stone is another Capcom favorite that didn't quite attain the kind of widespread sales needed to keep it alive, but this arena-style fighter was a true gem. While the original defined the fundamentals, sequel Power Stone 2 really amplified the action with four-player battles and giant bosses. Both are available in the Power Stone Collection for PSP, which came out in 2006, but otherwise this series hasn't been properly dusted off in more than a decade.