u/IndividualAd4710

Looking to get the platinum trophy for this game and wondering does it unlock all difficulty level trophies if you complete the highest level. Also how hard is it to complete the game on crushing mode while also completing the game in 6 hours or less?
Anyone who’s gotten the platinum or knows please let me know thanks.

Edit: I have played the game before but I only got 8 trophies, is it possible to get the platinum in one playthrough?