Crazy Taxi is a series of score attack racing video games that was developed by Hitmaker and published by Sega. The first game appeared in arcades in 1999 and was very successful, prompting Sega to port the arcade version to their Dreamcast console in 2000. It is the third best-selling Dreamcast game in the United States, selling over a million copies. The game was later ported to the PlayStation 2, Nintendo GameCube, and PC with sequels also appearing on the Xbox, Game Boy Advance, and PlayStation Portable systems. Each game has the player assume the role of a taxi driver who must accumulate money by delivering passengers to their destinations in the fastest time possible, earning tips by performing "crazy stunts" before the time runs out. The franchise has been recognized for its innovative gameplay design which is easy to learn but difficult to master, its use of in-game advertising, and its soundtrack music provided by the bands The Offspring and Bad Religion. The core gameplay mechanic has been patented by Sega, leading to at least one lawsuit over similar gameplay in The Simpsons: Road Rage, which has since been settled out of court.