In 1-4 you will encounter sonic and kirby there will be a flash bang and then the fusion will show up and start chasing you throughout the entire level. 2-1 will have you seeing mario.ixx walking out of the castle and then starts a dialogue with the player saying *well what did you expect, I WILL TAKE YOU WITH ME* and then a chase starts by running the right direction and then you gotta enter a pipe in the start. And for 2-4 Both MX, the fusion and Mario.IXX will be having a boss fight first one being MX's GroundEater form by stomping on him 20 time while he chases you on the bridge second is Mario.IXX oing the same thing as MX and for the fusion you will have to jump on sonic's head in it with 8 hits and then you beat the whole game