Mullsy

Aiden Muller, a.ka Mullsy, is an extremely skilled 240hz Canadian player in Geometry Dash who has both the world record from 0% and to 100% on the borderline-impossible  Extreme Demon Tartarus (a level uploaded unverified by Riot that is significantly harder than Zodiac, the current hardest level ever beaten in the game), with records of 91% and 41-100%. Whoever legitimately beats Tartarus will get a shoutout from Riot himself, this prize was, for a short time, discontinued after Riot got his channel terminated, but now Riot has a new channel and the prize is therefore up again.

Other Achievements
Mullsy also verified Generic Wave by Pennutoh (a generic remake of Sonic Wave) and has of course beaten the original Sonic Wave as well as the third hardest rated level in the game, Plasma Pulse Finale,  and on top of that,  Erebus, Devil Vortex and Step to Hell. Mullsy tends to beat levels that are close to falling off the Extended List to earn his completion mark on the levels before they fall off.

Unrated Levels

 * Levels Challenge - A challenge level with levels 1-5, with a wide variety of game modes.

Unreleased/canceled Levels

 * Tartarus - A collaboration between Riot, Cyclic, Aurorus, and a few other people (not yet uploaded, but Mullsy will upload the level once it is verified).

Trivia

 * Mullsy often uses a face-cam in his videos and streams.
 * He is known to have extreme patience and has stated he won't give up on Tartarus until he has beaten it.
 * His YouTube channel motto reads: No one, who has never given up, has ever failed.
 * He is #21 on the Demon List stats viewer, although having the biggest amount of completed levels on his stats profile out of any player, mainly consisting of Legacy Demons.
 * He has also done a 91% run on Tartarus.
 * He also declared he has around 128,000 attempts on Tartarus.