Got to round 31 with my buddy in Black ops 3 Zombies in the Shadows of Evil map, the map is big but there arnt much areas where you can make zombie trains, thats what makes the maps hard IMO. Video proof is above, just click the link. Whats your personal highest round in Zombies? Doesnt matter what map.
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I haven't even tried for a long run yet. I use to get to the 40's in blops 1 & 2 I'll try in a month when my addiction for fallout 4 is done.