Atari PONG was released in June 1972 and is the first commercially successful video game and is based on a simple two-dimensional graphical representation of a tennis-like game. Players use paddles to hit a ball back and forth on a black and white screen. Pong was the first game developed by Atari Inc., by Nolan Bushnell and Ted Dabney. Pong (marketed as PONG) is one of the earliest arcade video games, and is a tennis sports game featuring simple two-dimensional graphics. The player controls an in-game paddle by moving it vertically across the left side of the screen, and can compete against either a computer controlled opponent or another player controlling a second paddle on the opposing side. Players use the paddles to hit a ball back and forth. The aim is for a player to earn more points than the opponent; points are earned when one fails to return the ball to the other. Pong consistently earned four times more revenue than other coin-operated machines, which resulted in an increase in the number of orders Atari received. This provided Atari with a steady source of income; the company sold the machines at three times the cost of production. By 1973, the company had filled 2,500 orders, and, at the end of 1974, sold more than 8,000 units.[20] The arcade cabinets have since become collector’s items with the cocktail-table version being the rarest. Atari eventually sold more than 35,000 units, however, many more imitations were produced by competitors.