This dates me somewhat, but trials maps in UT2004 helped me develop a lot of precision and fast fingers.
It was a multiplayer FPS, but it had cool mobility like double-tap dodges, double jumps, wallkicks, and crouch jumps. And they could be combined in many ways, so there were platforming levels of varying levels of difficulty. Diagonal dodge-doublejump with a wallkick at the very end to get onto a platform that's like 4 inches square, type of thing.