The sixth BattleBots tournament continued the partnership with the Comedy Central cable network. BattleBots season 4.0 was filmed November 4 - 11, 2001 at Treasure Island - San Francisco, California.

This event continued the practice of allowing veteran ranked competitors to gain an advantage by sitting out the early rounds of the tournament. More than half of the 'round of 32' slots were reserved for ranked 'bots.

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