i tried the unholy cathedral a couple of times today, and while its very fun, it gets problematic when u get far in it, at araund 16-17 minutes i could hardy see anything, and was having very bad lag, and araund 20 minutes the game crashed, u should look into it, cause its a very fun level, but it kinda sucks if the game cant handle the bodies ( and the dead bodies ) on the screen, it especially sucks when it crashes after a long time playing it since u get no loot when it crashes :-)