i ran into a what i think is a bug on the mac version when i died i wasnt able to leave the game or anything until i force quitted it which took me a while to figure out.
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yeah, on zombies, just click play and move around. There is a crawler on the fllor at the start of every game, so that is probably what killed you. Click controls on the pause menu if you dont know how to play. Also, yeah on zombies it is supposed to make you force quit. It kindof like a if you die, you die thing