This map cracked up this reviewer so bad we doubt if we can be coherent in our description. It does contain aliens, who remain fairly well hidden. But those Moo rockets they fire with deadly aim, well, the last thing you see before you eat it is a Happy Face as in 'Incoming!'. So then, solo is definitely okay. Carnage area, up to 8 players, sez the author. Too funny, leave the aliens ON!