Speed Race

Speed Race is a one or two-player racing video game where players controls a race car along a constantly-scrolling vertical road. The player uses a steering wheel to move the car left or right and an accelerator to make it move faster. The objective of the game is to drive past other cars that scroll past the players under a 90-second time limit without colliding into them. The time limit and the player's score are displayed on an auxiliary LED display placed above the monitor.

Points are earned by driving past cars, with additional points being awarded based on how fast the car is moving. Colliding with a car resets the player's speed and starts them at the beginning of the track. The game ends when the time limit runs out, though the timer can be extended by earning a certain number of points. Two difficulty modes are available that increase the speed of the cars and the number of cars on the track.

Following the release of Atari's Gran Trak 10 earlier in 1974, Taito employee Tomohiro Nishikado decided to develop his own racing video game the same year; he did not enjoy Gran Trak 10, due to its twisting tracks and complex controls. Nishikado looked to two older driving electro-mechanical games for inspiration: Kasco's Mini Drive (1958) and Taito's 1970 rear-projection driving game Super Road 7, the latter in turn similar to Kasco's Indy 500 (1968) and Chicago Coin's Speedway (1969). Mini Drive and Super Road 7 involved driving a car down an endlessly scrolling road, with Super Road 7 also having the need to dodge cars in front of the player. Nishikado adapted these gameplay concepts into a video game called Speed Race. In order to simulate the scrolling effect and give the illusion of a moving background, he animated a background road image and modulated the speed of oncoming computer-controlled cars based on the player's speed.

In Japan, due to the complexity of the hardware, Taito released Speed Race at a price point of 100 yen per play, compared to the standard 50 yen per play up until then. Despite this, the game became a major hit in Japan, establishing 100 yen as the standard price point for arcade games in Japan over the next several decades. The updated versions Speed Race DX and Speed Race Twin were among the top ten highest-grossing arcade video games of 1976 in Japan, with Speed Race DX at number two (below Taito's Ball Park) and Speed Race Twin at number eight. Speed Race DX went on to be the highest-grossing arcade video game of 1977 in Japan, and second-highest-grossing overall arcade game below Namco's electro-mechanical F-1.

In North America, the game became a hit when it was released by Midway there in 1975. Wheels sold 7,000 arcade cabinets and Wheels II sold 3,000 for a combined 10,000 sold in the United States, making it the best-selling arcade game of 1975, according to sales figures provided by Ralph H. Baer. In March 1976, the first annual RePlay arcade chart listed Wheels and Wheels II as the second-highest-grossing arcade game of the previous year in the United States, in terms of coin drop earnings (below Atari's Tank and Tank II), while the Racer version was the year's eighth-highest-grossing arcade video game. In October, RePlay listed Wheels as the third-highest-grossing arcade video game of 1976 in the United States, below Sea Wolf and Gun Fight (both manufactured by Midway).

The game's use of vertical scrolling was influential on later games. One of the games it influenced was Atari's Hi-way (1975), which added a sit-down cockpit cabinet like older electro-mechanical games.

Speed Race spawned numerous updates, variations and sequels released by Taito and Midway in arcades.