Dungeons of Daggorath
by Radio Shack
A classic first-person maze game with a significant cult following (check the Flash app on ClassicGaming.com).
You can abbreviate most of the commands, and even objects, to one or two letters, though the downside of this is a fairly limited parser.
This and a few
are among the only parser adventures I've seen in a cartridge medium. The square, windowed grey box is the standard for Tandy CoCo games, though there's also a silver one with black logos.
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(Best viewed at 800 x 600.)