I could never play Metro Last Light on the PC, I was hopeful the Redux would fix it, but sadly it's broken for those who wish to beat it on stealth mode. There's a very common glitch where your character will suddenly fly as if climbing an invisible mountain while sneaking around, calling attention to your location to all enemies nearby. Guards and other characters will freeze in place in areas where they were supposed to look around allowing your to sneak by, now you're unable to do anything and the only way is the restart the whole level since the game works with an auto-save.