Navy says gamers have improved "fluid intelligence" http://kotaku.com/5457590/us-navy-video-games-improve-brains-fluid-intelligence "We have discovered that video game players perform 10 to 20 percent higher in terms of perceptual and cognitive ability than normal people that are non-game players," This makes sense to me. I'll use Halo as an example since it's a popular first person shooter. (However, games like Call of Duty require more strategy and keeping your head down like in a real battle.) In the canonical example, you have grenades in one hand and your smg in the other hand. The smg can't shoot around corners, but your frag grenade can. So if an enemy (another human... playing against comptuers is too easy) is hiding behind cover, you toss a frag grenade his way and he runs out, then you can shoot him (or her) down with your msg. Another tactic is to run around a corner, shooting with your smg, then stop and pull out your shotgun. When they come around the corner, BOOM! These all seem fairly obvious (but even in physics, isn't the solution always obvious after you've seen it?) but what's impressive is that we don't think up these tactics before hand. It's only looking back that I can see these tactics I've come up in a fluid way (thus, fluid intelligence) in the heat of battle. But you can apply this kind of thinking outside of battle. It's a matter of recognizing your situation, and knowing how your can apply your inventory to resolving the situation, even if the contents of your inventory weren't designed with your application in mind. But it's also a matter of knowing human nature so that you can bait people into thinking you're vulnerable and also knowing when you should run away and regroup because you're vulnerable. Sun Tsu would approve.