The Hell Factory

The Hell Factory is a ridiculously hard demon that was previously unrated due to hacks, where it was removed from the servers and then significantly buffed with a more 2.0-like design. It was verified by Powerbomb and reuploaded to the servers where it regained its demon and 10 stars rating.

Description
The Hell Factory was originally a lot easier than the version that was verified by Powerbomb. It was buffed twice. The first time increased the difficulty quite significantly, but was still easier than the second buff. The second buff added 2.0 features to the demon, and multiple spaces were made much harder because of it. This buffed version was eventually verified by Powerbomb and is now considered one of the hardest demons on Geometry Dash.