Ducktales NES beta build discovered with unused prototype song in it
Even if you've never played Ducktales on the NES, or its remake, there's still a good chance you've heard one of the game's biggest legacies: the Moon Theme. And thanks to a new prototype build that was discovered and written about on The Cutting Room Floor, fans will be able to listen to a brand new-old track that never made it to the final build of the game. Dated February 5, 1989, the Ducktales beta cart dump predates the final release on the NES by around seven months, with quite a few changes and missing features, as they hadn't been developed yet. However, one thing that's exclusive to the prototype build is a song simply called Map. It sounds similar to the Stage Select theme from the retail version, but with more variation and detail. It's not known why the song was cut, but you can listen to it on YouTube.
Source