Chapter 4 was the hardest for me as well. The biggest problem I had was that I was running low on ammo near the end of the chapter. Oh and the end of chapter 5 is almost as strenuous lol.
Beyond that it's not too bad.
As far as weapon and slow time cheats go, they can't be used in crushing until the game is completed on crushing once. Which does make things so much more difficult.







