Happy Wheels, created and distributed by Fancy Force, is a ragdoll physics-based platform browser game. The game was created in 2010 by video game designer Jim Bonacci and contains multiple player characters that explore the game's many stages using various, sometimes unusual, vehicles. The game is well known for its graphic violence and the quantity of user-generated content produced on a regular basis by its users, with game maps uploaded on a public server.

Happy Wheels has always been a hugely successful game. Several high-profile YouTubers, such as Markiplier and Jacksepticeye, popularized it by releasing a slew of videos in which they lose their minds and overact as they hurtle through various courses. The unnecessary levels of violence, combined with the bizarre physics, seemed to really capture the attention of viewers earlier this decade, and it's probably one of the first examples of a YouTube game.

Happy Wheels features approximately 60 levels to complete on the App Store with numerous quirky characters, such as an irresponsible father who tears around on a bicycle with his son questionably sitting in a baby seat without being securely secured into it. It also has a level editor that lets players make their own obstacle courses based on physics.