Forbidden Sector is a demon level by Vismuth (Aurumble). It is known for timings, tight spaces, and memorization. It is generally considered to be an Insane Demon.
The level starts with a fast wave with very tight spaces. Then there is a memorization based cube section. This is followed by a ship part with some tight spaces and orbs. Then there is a UFO part with some memorization and lots of tight spaces. Then there is a very tight wave part with some gravity portals to avoid. This is followed by a memorization-based fast ball part. Then there is a mixed dual of cube and ball, followed by an auto dual mini cube. The drop starts with a tricky ball part followed by a rather difficult but short ship part. Then there is a tricky ball part followed by a rather hard UFO section. Then there is a rather tricky wave part. This is followed by a difficult ship part. Then there is a mixed dual of cube and ship. Then an easy dual mini cube is followed by a rather tricky mini cube part and a fast-paced very tight mini wave with the text "GG" at the end. Then the level ends.
- This level is one of the better 1.9 demons according to one of the players that beat it.
- Stormfly failed at 96%.
Gameplay by Stormfly.