Level Information
Creator AirSwipe
Difficulty DemonDemon
Stars 10Star
Level ID 16695880
Song Gaster Theme (Rmx) Loop
Composer Djjaner

Gaster is a Demon level created by AirSwipe in 2.0. It is a remake of Airswipe's version of the battle when you encounter Gaster, a popular character in the indie hit game Undertale.


Gaster, besides monochrome colors, also has orange and light blue. These are used to indicate the pillars at the last wave and to sync with the beat in the first half of the boss fight. Gaster turns from a normal white with black level, into a pretty chaotic boss fight.


Gaster, along with Megalovania, has a lot of memorization. The first cube has invisible orbs and portals, so you have to memorize what you have to do. After the cube part, the level will switch to black with windings appearing on the screen. After the message, Gaster's face pops up for a bit and then the level throws you into the boss battle, with some hard timings and narrow ship parts. After the first half, you will be teleported down, as a mini wave at triple speed. Now you have to move through blue and orange pillars. After this, you will go through a almost auto cube part, and then it end with a pretty tricky ship part with invisible spikes.


  • Gaster was build in 1 day, but it took AirSwipe almost 4 days to verify it, mostly because of its difficulty.
  • Gaster was updated to a buffed version with some design updates. This update was verified by Danilkaz.
  • It's the first rated level to use this song.


-GASTER DEMON- Gaster by AirSwipe (me) - Geometry Dash -Demon?-01:57

-GASTER DEMON- Gaster by AirSwipe (me) - Geometry Dash -Demon?-

Credit to AirSwipe

Gaster Version 2 -Update verified by Danilkaz-01:22

Gaster Version 2 -Update verified by Danilkaz-

Credit to Danilkaz [Uploaded by AirSwipe]

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