Hi!
I too had troubly doing crushing mode, and still am, but im slowly getting through it. I completed the game about 2 times before i went to crushing, so i know a lot of where to go, and shoot before the enemies appear, like the other guy. But i believe the key to this mode is to have at least one or more of these:
Expert FPS performance/experience,
Luck; or
Patience.
If you have none of those qualities, then don't even try crushing.
If you do, and are, however, but need some tips – I would say just try not to get frustrated, and keep trying again and again until you pass the checkpoint. Think of it this way – Once you've passed that checkpoint, you never have to do it ever again! 🙂
That's really all there is to it!
