ECHO
ECHO is a third-person stealth/action game with a twist: The enemy AI learns from your actions. Everything you do is recorded by a computer, and after a set amount of time, the enemies in ECHO's world are updated and can now perform any actions that you did previously. However, they don't learn these things permanently.
Unbox: Newbie's Adventure
In Unbox: Newbie's Adventure, you play as Newbie, a sentient, self-delivering package. Newbie is the Global Postal Service's newest design, and he is its last chance at survival or else the company will go bankrupt.
The Simpsons: Hit & Run
The Simpsons: Hit & Run is an open world game based on the popular cartoon series The Simpsons.
Goat Simulator
In this game, you play as a goat. Go make new friends and destroy your enemies, as a goat. Explore a vast world or ignore everything and stare at a single blade of grass for a while, as a goat. Pick up a car with your tongue and throw it at some guy. He deserves it probably. Enjoy game physics which make "perfect" sense.