The gameplay is simple enough. You have various basic moves, combos, holds, and so on. The complications come in the form of the huge list of moves, featuring many different styles. Hit your opponent until he gets knocked out, or force him to tap out early.
There are multiple game modes included. Among them are a survival mode, that has you face a string of enemies with minimal recovery, and career mode, which allows you to customize and improve your fighting style as you win fights.