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You get to flopside by completing the stuff in Flipside, then there is some sort of passageway accessable from 3D mode that will lead you into a room full of mirrors, and then the door to flopside is right in front of you! (Sorry for the lack on info, I haven't played this game in a while.)

To elaborate on what's stated above, at the far right end of the first floor of Flipside, there's a cracked wall you can blow open with Boomer. Go through the hole by flipping and head back to the left in the area that follows. Eventually, you'll come to an interdimensional rift in one of the windows - use Fleep there to unveil a switch that grants access to a 3D passage to the Mirror Hall. Once inside there, hit each of the switches once in order from left to right, flip into 3D to pass through the broken mirror, and exit the hall to reach Flopside. TheGiftSig 07:36, July 14, 2013 (UTC)

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