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Add-ons are bonus campaigns that can be downloaded to play with Bethesda's new releases of Doom for PC, and consoles.[1]
These include official releases such as The Plutonia Experiment, and TNT: Evilution (stripped from their stand-alone Final Doom collection), and No Rest for the Living.
As well as unofficial sequels and side-stories including: Sigil, Winter's Fury, Double Impact, Doom Zero and Eviternity.
They are superseded by Featured Mods in Doom I + Doom II compilation.