Geometry Dash Badland by TamaN is a hard demon level rated 10 stars and 3 user coins.
Review by Orion
"I've practiced this on and off over the years as it was the final remaining demon level by TamaN for me to complete, this one being way harder than all the others. I saw Mangosteen record this one yesterday, and that gave me the motivation I needed to finally finish this off. Incredible level and certainly one of TamaN's best, unfortunately this isn't nearly as well-known like his others due to the spike in difficulty like I mentioned. I highly recommend this level if you can put up with learning the robot maze at 50%, also some of the timings there are just brutal, and it caused most of my deaths which didn't translate to an overall very enjoyable playing experience. Still, this is an amazing 2.0 level that I highly recommend if you're skilled enough to try it."