Happy Wheels' tagline is "Choose your inadequately prepared racer, and ignore severe consequences in your desperate search for victory!" The actual mechanics of gameplay vary because of character choice and level design; the game includes characters such as a businessman on a Segway.
The goal of the game also differs depending on the level. In most levels the goal is to reach a finish line or to collect tokens. Many levels feature alternate or nonexistent goals for the player.
Reviewers have noted that Happy Wheels exhibits graphic violence in its gameplay. For instance, players can be decapitated, shot, or crushed by different obstacles. Loss of limbs and animated blood loss are also graphic elements.
Players also have the choice to upload replays of their level attempts, which can then be viewed.
Happy Wheels features a level editor which allows players to create custom levels of their own. It contains a plethora of tools and objects for level building. Users can upload their maps to a public server where they are accessible.
This article uses material from the Wikipedia article Happy Wheels, https://en.wikipedia.org/wiki/Happy_Wheels, which is released under the Creative Commons Attribution-Share-Alike License 3.0, https://creativecommons.org/licenses/by-sa/3.0/.