Hi all, i am a master pro at this game if you need help just ask me. I now trick on getting silent assassin that no walkthrough has. For example. alot of people have been complaining about the mission hidden valley. Here is my 3 minutes walkthrough on how to beat it.
What ive been seeing is people going into the trucks underground but getting caught or sniped at. My method is much easier to get silent assassin and only takes 3 minutes.
First, run towards the hitman sign where you get your crossbow. Run in between the trees so the sniper doesnt see you.
Second, wait till the guard near your equipment turns his back and gas him and steal his uniform. Believe it or not this is the hardest part of my walkthrough. First use stealth to get behind him. He will be ahead of you of course then run toward him to gas him. Make sure he doesnt turn around. Keep trying till you get this right its not hard. Once hes unconsious, take his uniform and look at the map. look for the exit and memorize how to get there. You have to run straight up for a while and then take a right. Next, old on the run button and just run to the exit. Easy silent assassin. While your running, gaurds will shout for you to stop. DONT STOP RUNNING!!!! dont even stop to check your map. these guards will run after you but you are faster then them.
If you any questions just ask!

how to get past the snipers in at the gates?