I heard about a game, what's the name?

I know what it's like i want to get it but i need to know the name, the game is where you are trying to get to a destination, but its blocked by an obstacle, such as a hole or a wall, but theres a large tower sitting next to it, you turn the view slightly so the tower covers up the obstacle, giving the impression that if you cant see it, then it isnt there, allowing you through, what was the name of the game again?