the best difficulty to play on is expert, you have only a small amount of instinct and it doesn't regenerate, when you become suspicios to somebody you have abot 1-2sec to get out of sight or he will come after you screaming STOP WHO ARE YOU STOP (fucking moron, if nobody else is near you and that guard you can fake surrender and kill him but if others are near then reload last checkpoint is next thing to do ), on purist the detection window is 1sec, if you come somewehere where guards are and you are dressed as a guard your fucked...dressed as a electrician you can walk everywhere the guards won't detect you but of course ther is some other fuckin electrician who fucking screams WAIT WHO ARE YOU gtfo every guard is then waching at you looking what is going on. Only on expert and purist there are more guards in a level makin it much harder. Somtimes a guard screams hey you come over here (i was like wtf im not detected) i'm ignoring him and he keeps screaming come over here you idiot i'm talking to you, so i go to him and he says what are you watching you moron and leaves, fucking ass. The game is fun i got i today, i want to play on pursist but the fckn detect you immediately it's frustrating. sorry for english i'm german.