Kotaku was recently contacted by an anonymous source that worked on the original Xbox. The person shared an Easter egg that, to the best of their knowledge, has remained undiscovered for almost 20 years.
It’s nothing groundbreaking, mind you, and the leaker even said they didn’t expect it to be found unless the source code leaked or someone reverse-engineered the Dashboard, but it’s still pretty remarkable that none of that has happened yet.
Details: This copy is further unique in that it is a “No Code” type, meaning it only says “NES – GP” on the back of the box by the Nintendo logo (other variants have game-specific codes), and is sealed in shrink wrap. What’s more, the “TM” marking is missing from the front of the box after the word “System.” It’s also a “No Rev-A.” variant.
An ultra rare version of the original Super Mario Bros. for the Nintendo Entertainment System has fetched an astounding $660,000 at auction.