Originally Posted by Joooooink
To platinum you do have to play through the game 3 times (normal, hard and EX-hard) so don't worry.
However, please take note of the trophy Indomitable (Clear Normal Mode without reverting to Easy Mode).
If you play on normal and revert to easy you will screw that trophy and will have to do a whole new playthrough on normal.
^^^Good point made here. Keep in mind this must be done on normal. You can't get this trophy for not reverting on your hard or EX-hard playthrough