I really like playing "Immersive Sim" games (aka Prey, System Shock, Deus Ex, etc) because they generally have really tough combat but open ended gameplay. This

I really like playing "Immersive Sim" games (aka Prey, System Shock, Deus Ex, etc) because they generally have really tough combat but open ended gameplay. This means you must think very carefully about every encounter to come out on top.