Happy Wheels is a popular online game that combines driving, parkour, and physics in a humorous and gory way. The game was created by Jim Bonacci, a video game designer from Ohio, who launched it in 2010.
The game allows the player to choose from various characters, each with their own unique and often atypical vehicle, such as a bike, a Segway, a wheelchair, or a sleigh. The player then has to navigate through different levels, which are user-generated and can range from realistic to absurd. The levels can include various obstacles, such as spikes, mines, harpoons, cannons, wrecking balls, and more. The goal of the game varies depending on the level, but it usually involves reaching a finish line or collecting tokens.

The game is best known for its graphic violence and ragdoll physics, which make the characters react realistically to collisions and injuries. The characters can lose limbs, bleed profusely, or even die in gruesome ways. The game also features realistic sound effects and voice acting, which add to the humor and immersion of the game.