Editing Tartarus (section)

===Verification race===
After a long period with no one seriously attempting to verify the level, Canadian player Mullsy started practising Tartarus on 3 January 2019, when he uploaded his first progress video showing he had reached 32%. It was already close to surpassing the former world record of 39%, set by GD Lapis earlier. Three days later, Mullsy completed a 52-100% run, his first world record. On 9 January, Mullsy broke the world record from 0%. He achieved a 40% and a 22-57% run, which included some of the hardest parts.

On 16 January, Mullsy completed a 41-100% run. On 26 January, he set a new record of 45%, setting both world records. He would beat his records many times. He then achieved runs of 22-84%, 61%, 64%, 73%, and, on 29 March, a breathtaking 91%.<ref>https://www.youtube.com/watch?v=5F1IrMm2EAM&t=82s</ref> After this, progress videos slowed as Mullsy took a break from the level. When he returned, he completed a 35-100% run, and six days later, a 21-100% run. On 26 July, Mullsy failed at 97%, crashing at Salaxium's final wave, a death which, at the time, was arguably the worst fail in [[Geometry Dash]] history.<ref>https://www.youtube.com/watch?v=fNoPN-CwjKg&t=86s</ref>

Mullsy's progression inspired multiple people to start a race for verification, most notably Dolphy and MetaManRB, who quickly made progress on the level. MetaManRB set records of 20-97% and 53%, while Dolphy quickly reached 55%, placing him second behind Mullsy, who already had 97%. Dolphy would take a break from the level before returning more than four months later, with a new best of 78%. After returning, he started making fast progress, dying at 91% five days later. He also completed a 23-100% run two days after this new record. On 30 December, Dolphy failed the penultimate ball timing at 98% before verifying the level a week later, on 6 January 2020, after 61,746 attempts.<ref name="Verification"/>