Double Dragon 2 (1989) is a beat'em-up game that shows the true value of teamwork. Despite sibling rivalry, Billy and Jimmy help expedite their common goal with well-timed knees to each other's faces.
This new version by xipo is 00:18.52 seconds faster than the previous effort by adelikat. Most of the improvement came from better application of glitches.
If you're more a fan of runs where one macho man defeats an entire gang alone, there is also a one-player run available.