Let's take it way back to the earliest days of 3D platforming. It's everyone's favorite failed mascot: Robbit! (Pronunciation yet to be determined). The story of Jumping Flash! is kind of sad, because it nailed so much about how to make a platformer feel good... then just kind of went away. It's an evolutionary dead end that lives as a footnote about the PlayStation, and little more. But you shouldn't ignore it.