Deus Ex: Human Revolution is an action-role playing game. You play as Adam Jensen, a high-ranking security officer who takes down secret corporations with the aid of his advanced cybernetic implants.
Pro You can take a lethal or pacifist approach to missions
You have total freedom in how you approach missions, mainly with whether you want to take the silent approach or go in guns blazing. Going with weapons such as stun guns, picking non-lethal knock-outs, and sneaking around through vents and hidden passageways makes up the pacifist methods. The more violent ways of playing include using deadly guns and abilities, killing enemies when you take them down, and generally running head-first into each mission. You don't have to stick with one or the other; if the situation calls for it, you can change things up as needed, keeping things interesting as you go along.