i already beat this game in veteran mode but its very hard you need a fast hand to beat veteran mode to be sure you can beat it try to finish the call of duty black ops
to prevent the bug like the metal gate is closing and over and over again try to not to max the players that should work in 80%if you dont believe me make a rum without playing with max players but max players in coop-survival mode is free from bugs so you can play max players in coop- survival if im wrong if im right pls...make my comment thumbs up (i already palyed this about a thousand time