Flipped is a singleplayer puzzle map where gravity doesn't matter. It is based on manipulating gravity to get to a destination. For each level of flipped, you start at the gray block and finish on the black one. You travel across white blocks, and walk up walls with green blocks. There is a new block type added each level, such as a switch block or a teleport block. By the end of each level, you will have forgotten which way is up.
The map contains 10 levels, each level adding a new element of gameplay. It took around 2 years to make (on and off), since a single level is so complex redstone-wise, so I really do appreciate anyone who plays it.
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