xzi
Mouthbreather
DOOMs "co-op" is the snapmap. It's *technically* co-op, as you can build custom games to play with friends (or download someone elses maps to play). But you can't play the campaign co-op.
Side-note: the snapmap runs off of the multiplayer engine rather than the single player so the mechanics feel very slightly off as well.
Side-note: the snapmap runs off of the multiplayer engine rather than the single player so the mechanics feel very slightly off as well.