Chaos Theory is one of those few games I consider to be near perfect. It captures perfectly the idea of getting in, accomplishing your task, and getting out without anyone being the wiser. It gives you a wide range of freedom in approaching your target. It allows you to either kill/knock out guards or leave them as you choose. It provides a nice variety in the tasks you're supposed to accomplish. In short, no other game I have ever played has made me feel more like a super ninja than Chaos Theory. It forces you to be aware of your surroundings at all times and makes you strategize. Not the most fast-paced game out there, so it might not be for everybody, but few other games have been as deeply satisfying to me as Splinter Cell: Chaos Theory.