Run while floating on wall glitch in Multi-player:
Have two Nintendo DS systems and the game for both of them. Start a multi-player game on the Ancient Vestige level and have both players go to the corridor shown on the right side of the map (with the damage power-up in it). At the start of the corridor where it connects to the rest of the level, have one player face the wall with two pipes running horizontal on it. Jump forward towards the pipes and continue to walk forward until your screen shakes up and down while you are running forward. Then, have the other player look at the player who is still walking into the wall. The other player will see the person running in place, floating above the ground in front of the wall.