Update v1.2.12:

Difficulty Update: it adds Easy, Hard and Hardcore difficulty modes. Each difficulty setting applies general tweaks to game mechanics and to the enemy perception and behavior.

Fixed a building in Chapter IV that you could go through

Fixed a bug that blocked looting enemies if the body was on a sewer

Fixed a bug where SYMs got stuck in front of an open door in Chapter V

Fixed a bug that was causing the SYMs from a sidequest in Chapter III to stay neutralized even if you died or restarted the checkpoint

Fixed a bug that was causing some minor materials to not be counted if you picked them up when replaying a chapter