Rebound (video game)
Development of "Rebound" began in late 1973, as one of several variations they produced in 1974 on the gameplay of the successful "Pong" (1972), Atari's first game and the fourth-ever arcade game. Around the same time, Atari launched Kee Games, a subsidiary meant to produce clone games of Atari's products and act as a competitor in order to expand into more distribution channels in the same region than the industry typically supported. Kee's first game, released in March 1974, was "Spike", a clone of "Rebound", which added a "spike" button to the game that made the paddle jump up and attempt to bounce the ball downwards instead of up. In addition to the base game, Atari sold a conversion kit to convert any Atari two-player "Pong" variant into "Rebound", and in 1977 "Rebound" was included in "Video Olympics" for the Atari 2600, a collection of "Pong" variants.
Space Invaders
The 1980 Atari 2600 version was the first official licensing of an arcade game and became the first "killer app" for video game consoles by quadrupling the system's sales. It sold over two million units in its first year on sale as a home console game, making it the first title to sell a million cartridges. Other official ports were released for the Atari 8-bit computer line and Atari 5200 console, while Taito later released it for the Nintendo Famicom in 1985 (Japan only). Numerous unofficial clones were made, such as the popular computer games "Super Invader" (1979) and "TI Invaders" (1981), which was the top-selling game for the Texas Instruments TI-99/4A through at least 1982. Adjusted for inflation, all versions of "Space Invaders" are estimated to have exceeded $13 billion in gross revenue, making it the highest-grossing video game of all time.