Games like Challenge 99

Games like Challenge 99 include Super Meat Boy, Geometry Dash, Marble It Up! Ultra, Celeste, and SEUM: Speedrunners from Hell. We matched them by the tags players give Challenge 99 on Steam (3D Platformer, Precision Platformer, Difficult, Fast-Paced, and Arcade): closest matches first, and among equally close ones the better-known games.