Crazy Taxi is a video game developed by Sega AM3 and published by Sega for Sega NAOMI arcade hardware in 1999. It is a non-linear action/game, in which players drive a taxi across a stage inspired by San Francisco, picking up customers and ferrying them to destinations in the fastest possible time. It builds on previous experiments with this genre such as Harley-Davidson & L.A. Riders.

The main objective of the game is to pick up customers and take them to their chosen destination as fast as possible. Along the way, money can be earned (the game is primarily a score attack title) by performing outrageous stunts such as the "Crazy Through" (near-misses with other vehicles; both risk and reward are higher when driving against the flow of traffic) and "Crazy Drift" (extended, barely-controlled skidding).

When the destination is reached, that customer's fare is added to the player's total money earned, while "Speedy", "Normal" or "Slow" ratings are awarded depending on how long the player took to complete the journey. If the player is too slow in reaching the objective and the customer's timer runs out, a "Bad" rating is given before even reaching the destination, and the customer jumps from the taxi. There is no penalty for a "Bad" rating, but time will have been wasted attempting to deliver this customer. However, there is often sufficient time available on the main clock for the player to pick up another passenger with hope to make up for their loss. On the arcade version, if a player earns a "Bad" rating, the next fare starts at $0.00.

For each level, one can play under different time conditions: three-minute, five-minute or ten-minute settings, or the "Arcade Rules" used in the original coin-op version of the game but which was also included in the home versions. In the three time-limited settings, play continues for the designated period of time, after which the cab automatically stops and no more points can be scored.

Under Arcade Rules, the player starts with an initial time limit of around a minute (although in this first Crazy Taxi game it can be changed in the options screen), which can be extended through time bonuses earned for "Speedy" and "Normal" deliveries, as well as by making good use of whatever time is left over after making a delivery. Expert players, able to memorise the best route from pick-up to delivery, can thus continue playing for long periods of time - however, as time goes on, the "best" passengers will have been taken to their destinations, leaving fewer potential customers remaining, so as the game continues the challenge increases.