Hitman Codename 47
Each and every mission in Hitman 1 Game comes with more an more fun that takes place in an open enviroment with guards who are armed and some civilians. You will get your target details from the agency and what you have to do in each mission is to find your target and kill him thats it. There are two methods for doing so. You can reach your target voilently or you can also reach your target withought raising the alerts like may be killing them the way other gaurds or civilians don't see you.
Hitman: Codename 47 starts in a prison, you are trapped and need to escape. The prison also serves as the training level, so it's not really difficult. After a successful escape the screen goes dark and there you are, some years later, working on another assignment.