Tony Hawk's Underground, often abbreviated as THUG, is an extreme sports video game for the Microsoft Xbox, belonging to the action-adventure and skateboarding genre. Released in 2003, it deviates from the traditional level-based gameplay of its predecessors, featuring a narrative-driven campaign where players embark on a rags-to-riches journey in the world of professional skateboarding. The game introduces a personal story, freedom to explore vast urban environments, the ability to dismount the board and walk, and extensive customization options, including creating a custom skateboarder and tricks.