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How do i play multiplayer with Duke Nukem Atomic Edition? there dosn't seem to be a multiplayer option which is weird as the review states that the game has online functions

I'm not sure if the Atomic Edition can do Online Multiplayer out of the box, because Duke Nukem 3D used a long defunct matchmaking service called TEN back in the day.
I don't know if there are serve emulators or something like that for this, so the easiest option for online multiplayer are source ports like EDuke32. Or it could work with the LAN mode of the GOG version if everybody does configure port forwarding on his router right, but I'm not sure about this.