The environment around you moves and allows you to fully interact. From full conversations you have with people where you can choose your responses, to the ability to use stealth and shadows to move about, there isn't much you can't do in DX 2. In fact, you can even chose whether or not to kill your enemy combatants or not. Sometimes simply shooting them in the leg is good enough to stop them from shooting at you, especially when you know you're running out of ammo. In addition to weapons you can carry an array of tools including the "multi-tool", which can open special locked boxes or hack into keypads and different computers. You can find special binoculars, various grenades (like the spiderbomb, which is really cool. It actually drops robot spiders at your opponents feet with zapping lasers), and noisemakers. Also, objects around the "world" can be moved, picked up and thrown, or otherwise manipulated in a variety of ways to accomplish what you're trying to do. Why shoot someone when you can hit them with a wooden crate and knock them out. Once again, choice.