Famous "secret dot and room". On game 2 or 3, find the dot in the Black castle's catacombs. Next, drop the dot and two other objects (except the bridge with the sword, Chalice, or magnet) in the room down and to the right of the Gold castle. Pass through the barrier to reveal the message, "Created by Warren Robinett". A dragon can also be used instead of 2 objects. You can also pass through the lower right barrier underneath, although there's no room behind it. Adam Clayton wrote to Atari in August 1980, describing how to find the dot and unlock the message, a year before Electronic Games magazine confirmed its existence, and nearly 2 years before Atari published the details in their Atari Age magazine. Warren even kept a copy of Adam's letter!
See the Atari Compendium website for more information:
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