Getting Past General Corrosive
When playing in the coliseum, you will fight against General Corrosive in the last match. You cannot hurt him. When you enter the arena, run to the far right side. There is a box that has a health in it. Hide on the side opposite General Corrosive and get him to destroy it with a rocket. When he does, get the health. There is also a wrench when you get the health. Run from the general and hide in one of the small huts. When inside, quickly disassemble yourself. The general will destroy the hut and find you in pieces. A short intermission sequence will play and you will proceed to the next level.