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I made it a principle not to...
[...] and I believe one of the Monkey Island sequels let you play the original (something to do with the programmer realizing that one of the animations was bigger than the entire original game).
Aha!
Apparently every level of the new Doom-game is going to feature a hidden classic level, too:http://www.shacknews.com/article/94398/id-software-reveals-retro-easter-eggs-in-new-doom