When on the main bit of the game, the bit where you choose a level in one of those area thingymabobs, you notice how the floor is all shiny? well, if you have an aku aku, walk around that glassy floor and look at aku akus reflection. it looks like there is a rocket following you if you look at it long (and hard) enough. oh yeah, and if you don't already have an aku aku, just go to some random level and get one. then just go to the menu and select 'warp room'.