Hey. I would post this on the Serious Sam Forum, but I feel like I might get more responses faster here. Anyway, playing the first Serious Sam, when I get to the third level, all the floors and walls disappear, I fly around, and there is no way for me to kill enemies or otherwise proceed. I have started multiple New games, uninstalled and reinstalled the game, and haven't modded or altered it in any way, hoping someone can help me out.