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Geometry Dash Theory of Insomnia is a Hard Demon level rated 10 stars created by Dorami. Even for seasoned players, this level is notorious for its convoluted design and several bogus spheres, which make it very challenging to complete.
The first part of Theory of Insomnia requires the player to leap over spikes in a brief cube portion. The following section asks the player to change into a wave and glide through extremely constrained spaces at a slow speed. Players must know where to roll and avoid countless bogus spheres in a challenging ball segment.
Then comes a wave with complicated pathways and another little ship, followed by a tunnel of blue trampolines and a quick ship portion. Before there is a complete block blackout and an even faster cube stage, the tunnel's speed progressively drops. The player must quickly click on the appropriate spheres in this section and leap on the blocks. The player must then make their way through a particularly challenging wave segment that features tight spaces between blocks and gears. A brief UFO phase and a heavy ball stage come next.
The player must next fly through a spike tunnel in a ship portion before moving on to a UFO segment, where they must fly over the creator's nickname.