Geometry Dash Acid Rush III

Geometry Dash Acid Rush III (commonly known as Acid Rush 3) is an epic Hard Demon mega-collaboration level rated 10 stars and 1 user coin, created by Serponge, Spu7Nix, wulz/Wulzy, Thomartin, Samoht, TTP, ChaSe, Goose, Erdyuri, PotatoBaby, Sandal, Sharks, Codex, Rafer, and Kips. As its name suggests, it is the third and final level in the "Acid Rush" trilogy, proceeding Acid Rush and Acid Rush II, and is considered to be one of the most challenging levels in the series. This level is famous for its heavy usage of mixed duals, XL length, and numerous timings. The numerous timings add to the level's difficulty, with Acid Rush III requiring the player to react quickly and accurately to different obstacles. 

Despite its difficulty, Acid Rush 3 is famous among Geometry Dash players and is widely considered to be a must-play level. The level was created and published by Serponge and verified by Nexus, adding to its credibility and popularity among the Geometry Dash community.