Atari 2600 Game
Produced by: Atari
Year of Release: 1982
Aquaventure is a fairly complete prototype game for the Atari 2600. Basic idea seems to be to shoot fish and sea monsters without running out of air. The game does exhibit some odd behavior from time to time (bad collision detection, vanishing monsters, etc).
This game is emulated by all the popular Atari 2600 emulators (Z26, Stella, etc), but there is little reason to bother playing it.
This game was never finished and exists only in prototype form. I am unable to put a value on it at this time.