You must have Boomer and Fleep as a Pixl for this trick. First, go onto the first floor on Flipside. Then, if you go to the end, there will be a crack in the wall. Use Boomer to explode this crack, and flip to enter. Then, you will see the Lightning-Shaped Thingie (Or whatever it's called). Use Fleep to flip the Thing, and a big unfilled box will appear. Flip, and go through it. Walk on the bridge, and go into the door. It will bring you to a place called: Mirror Hall. Hit all eight blocks at least one time. No order required. A piece of glass will break, flip, and go through it. When you ever flip on the other side of the Mirror Hall, it will be backwards. Go into the door, and it will be the same place, but it will be night time. Flip, go to the other side of the bridge, and the place looks backwards, as it is. Just so you know, EVERYTHING will be backwards. The place will just get weirder and weirder.
Added by: SMK963 Feb 16th 2011, ID#4305