iD Software recently revealed to IGN that the the upcoming Doom game features hidden easter egg levels from the original Doom and Doom 2. In each level of the new Doom campaign there is a secret lever that if pulled opens a door to a classic mission. This mission is then playable in the current mission you are in or unlocked and playable from the main menu. This iD tradition of including the original maps from classic games started with Rage continued to Wolfenstein: New Order and now to the upcoming Doom game. Hopefully you can unlock much of original games this way to play through it in total in the new engine.
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