Sentinel is a 1990 video game developed by Imagineering and published by Atari for the Atari 2600. It is the only light gun game ever released for the Atari 2600 platform. It was re-released with improved graphics for the Atari 7800 in 1991.
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Might be the most low-tech light gun rail shooter ever made which is the only interesting thing about this one.