i got badges, i beat lvl 20, my key to beating that level was leaving the 5th light on, since there is little space, i let other rows go one by one, then i rushed the vehicles when i only had few more cars to clear
i hope they make a 3rd one with zombie animations changed, different zombie sounds, and some hell hounds! and Junx980's comment about auto fire, reminds me of the power ups from cod5 zombies. i sure hope they make a 3rd zombies here:)
the 4th episode wouldnt be on the trilogy anyway, Doom: the ultimate is the only version which has all 4 episodes. Knee deep in the dead, The shores of Hell, Inferno, and thy flesh consumed.