Free Brutal Doom: Hell on Earth campaign mode available now
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Expansion adds 32 levels to Brutal Doom mod.
Brutal Doom's Hell on Earth expansion is now available to download for free.
Hell on Earth is an expansion to the bloody popular Doom mod, adding new levels set in Hell, Mars and Los Angeles, and a bunch of set pieces throwing in tanks, jets and a tonne of UAC Space Marines.
Over on the Mod DB site you can grab a "unzip and play" pack that allows you to do just that, without any editing, although it is recommended you playing using a commercial version of Doom II rather than FreeDoom.