Jack trades in his normal outfit for a raver outfit. He trades in his sword for punches and kicks in the style of Brazilian dance-fighting. It goes without saying, he's also traded away his dignity.
Play Samurai Jack: Rave Slaves @ Toonami: Lost Data

(The one game in which Jack isn't permitted to fight back.)
Why was "Jack and the Rave" made into a game when there were better episodes such as "Jack and the Ultra-robots" that could make better/more popular games? I don't think anyone will ever know now...