Which games are designed for speed running?

[F0X]

archbrix said:
Donkey Kong Country. During the ending, Cranky Kong says, "I did this using one life and it took less than an hour." I made it my goal to achieve this on a game file and finally did, all while attaining 101% as well. My point being that the game is designed in many sections to haul ass, bouncing from enemy to enemy to blast through the levels. Fun stuff.

I second this. DKCR took it a step further by adding a Time Attack mode, and the levels once again were designed for significant amounts of ass-hauling.