Go to the mystic ruins with knuckles and go to the forest by using the mine cart near the waterfall. When you get to the forest glide across to the big structure in the middle and go to the eggman door that leads to the place where e-102 does the final egg level. jump on top of the door and walk past the yellow fence (while still on top of the door). you should drop into the place behind door. shift the camrea angel using the left and right triggers until you can see the front of the eggman door then walk over to it making sure you are in the middle of the door. use the d-pad to look in first person veiw and you shold be inside the door. to get out go to the oppisite end of the place behind the door (away from the eggman door) and tap b b b or x x x to do a tripple punch. you will fall off the edge and lose a life but it is worth it.