I finally figured out how to get past the spot I was stuck in in level 2 of Rayman Raving Rabbids for GBA. After trying different button combinations with various costumes, I figured out if you spit out gum in the black costume onto a stump, it turns into a bouncy thing, like a mushroom. That opened up new stages and now I'm at the boss of level 2. I don't even know why they bothered with lives because no matter how many times you get a game over, you start exactly in the same spot you were in.