Kaboom! is an Activision published in 1981 for Atari 2600 that was designed by Larry Kaplan. It was well-received and successful commercially, selling over one million cartridges by 1983.Kaboom! is an unauthorized adaptation of the 1978 Atari coin-op Avalanche. The gameplay of both games is fundamentally the same, but Kaboom! was re-themed to be about a mad bomber instead of falling rocks. As an ex-Atari programmer, Larry Kaplan, originally wanted to port Avalanche to the Atari 2600.