This is a tool-assisted speedrun. For more information, see http://tasvideos.org/2538M.html
The follow-up to Tekken is a versus fighting game featuring similar mechanics, with four buttons assigned to left and right punches and kicks. New moves include back throws, chain-throws, and a sidestep unique to Kazuya and Heihachi Mishima. Tackles now inflict damage depending on the distance.
The authors of this TAS, Spikestuff (http://tasvideos.org/Spikestuff.html) and N?K, aim solely for fastest