dont you wish you could turn some skulls off.. or add some like blind and fog and customize which ones are set skulls which ones are round skulls... u get the idea
personally id like the ability to turn em off (obviously the difficulty multiplier would go down heaps and it wouldnt go on leaderboards) but just change it so it was more like gears of war horde... minus how the ai gets stronger... just more of them would be awesome
[Edited on 01.23.2010 5:32 AM PST]
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how about skulls that effect your enemies in funnier ways? like its all grunts with swords and you have a pistol with unlimited ammo? Create a skull, like choose what enemies there are, how tough they are and so on.