the only problem here that it has only 3 stages....
btw i completed tribute on soldier from wave 1...i was alone until wave 18-19 with 2 turrets in the first building, on the 2nd floor in that long tunnel...one guy came for a 2 waves...then he left but around 25th wave someone connected and im glad it was an experienced person, we activated all the supressors, got into operations and somehow survived the last wave without turrets at the respawn point
im so proud :DDD
but setting up the turrets in the corridors was the stupidest thing...outside they worked very well and in that long tunnel also but in the corridors we were manhandled by the xenos