The Mark 1.0
the author of this app says:
You are atop a building in New York City. There's a man standing in front of the coffee shop. It's your mission to keep him alive. There is a man walking through the park enjoying a Sunday stroll, or is he really the hitman carrying a gun? This is just one of the scenes you can play in which you are the sniper armed with your choice of weapons. You might want to run through the trial first to get some target practice. These guys have thought of everything!