This is easily the best level in terms of gameplay currently in the game, in my opinion. Both SoDaZ and Vlacc were at their peak when making this level. Cloud Nine is a level who's layout is made by Vlacc and was decorated by SoDaZ. The gameplay of this level is a blend between a fast paced learny level and a memory level. For similar gameplay check out FFFFFF and Spearmint by Vlacc (shocker).

The best way I can describe playing this level is like being on cloud nine (I know it's corny, but it's the truth), the drop is straight up the best piece of gameplay I have ever touched. It is an absolute monster to learn, but it is completely worth it in the end because it's insanely consistent and satisfying to do. Despite the gameplay being incredibly fast, it's not high cps really at all. Cloud Nine instead has memory gameplay that is less about memorizing a ton of fakes and false walls and more about finding the correct way to navigate a section. The slow half of the level after the drop, although not as good as the drop, is still incredible too. It has the same level of care and love put into it as the first half does. Genuinely, this gameplay is perfect and Vlacc did an incredible job.

The decoration of this level is also amazing. It is basically a design style level with tons of effects and backgrounds, the usual SoDaZ style. What I love so much here is how the decoration in the drop adds to the level's sense of speed and adrenaline. The individual parts are simple, but the come together in such a way that it elevates the level to incredible heights. Truly amazing work from SoDaZ here.

Unfortunately this level is more on the mid-high range of Insane Demons, so it's not exactly accessible to everyone but it is worth you time if you are good enough to beat it. There is a reason this is one of the most well received Insane Demons of all time.