Developer: Piero Cavina
Piero Cavina is an Italian programmer from the early days of the Atari 2600 homebrew scene. His first game, Oystron, came out in 1997 as a free 4 KB program for the Starpath Supercharger and emulators, and was later issued on cartridge by XYPE. You shoot space oysters, collect the pearls they leave and guard them from thieves until the boss, Oystron, appears. Activision later included it in the Game Boy Advance version of Activision Anthology.
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