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Higher levels (Insane+) are basically a survival mode. Brawlers will do the damage for a few seconds and will die. To keep the game going, one Brawler must collect all Power Cubes and keep running to survive as the other ones will do most damage. Leon is great to be this one and survive forever. He is very fast (runs away from rockets quite easily) and has the invisible ability to get some time to cover. A great combination is Bull and Colt to do the damage + Leon to be the one running (to survive and get all cubes).