Help! Can't enter the last level *Spoilers inside*

[jens]

Sounds very odd, can't recall hearing something similar. I think you have to try and first do a file integrity check on the game in Steam, then you have to load the last save from before this level. If something was wrong on loading it the first time then chances are the save for the level is corrupted, so that is why loading a save from this level will not help.