Some notable levels he has published are Dim (a full three-dimensional game), Brainfugd (an IDE for the programming language Brainf*ck) and Place (the largest mega-collaboration in the game with 14,010 creators). Much of his YouTube channel's content includes showcases of his own levels, but it also features explanations for his effects and concepts. Some of his videos have garnered millions of views.
WHAT - The sequel to HOW featuring far more realistic 2.5D and 3D effects including third-person point of view.
Xolis
Easy levels
Ocean Of Dreams (featured) - One of the most liked Easy-rated levels in the game, with 1.4 million likes.
Normal levels
Aether (featured)
Gaia (featured)
HOW (featured) - One of Spu7Nix's most famous levels because of the highly realistic three-dimensional effect of the icon and the objects throughout and the cinematic effects. It won Best Effect Level in the Geometry Dash 2020 Awards, getting 19,113 votes and having the highest amount of votes out of any level awarded in the Geometry Dash Awards.
Mezmerized (featured)
Hard levels
Aerosol (starred)
Apex (featured)
Astros (featured)
Enchanted (featured)
Eon (featured)
Grittering Stars (featured)
Hallucion (featured)
Heliocentric (featured) - His first rated and featured level.
Brainfugd (Epic) - A coding software created in the Geometry Dash editor.
Medium Demon levels
Dim (featured) - A three-dimensional mini-game in the Geometry Dash editor that uses many illusions and effects to give off the three-dimensional style.
Glimpse (Epic)
Ominous (featured)
Extreme Demon levels
Place (starred) - A mega-collaboration inspired by Reddit's r/place containing 14,010 creators and the title of the mega-collaboration with the most number of creators.