Need for Speed: Underground Rivals is a street racing game developed by Team Fusion and published by Electronic Arts, released for PlayStation Portable (PSP) on March 28, 2005. The game emphasizes illegal street racing culture, featuring customizable cars, tuning options, and high-speed races through urban environments. Players compete in various events, including circuit races, drag races, and drift challenges, while unlocking new vehicles and upgrades. Designed for portable play, the PSP version offers multiplayer via ad hoc mode, realistic car handling for the system, and a focus on personalization and competitive street racing, making it a popular entry in the Underground series for handheld gamers.