I have Doom3 and the expannsion still installed and all the saves...let me know if yo uwant me to go back in and find something...I remember one lvl I went round and round and even was in the room with the BFG and never clicked on it...finally i clicked on it or shot the glass out and grabbed it...I remember shortly after that some big critters where you need it..you will definalty need it.
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O yea...when they step thru you need the BFG......if you make it thru them without it you rock lol...