I've been seeing a lot of ads on TV for the Nintendo Gamecube game, Geist.  You are part of a Special Forces team that is infiltrating a secret lab.  You are safely on the way out, when one of your teammates suddenly flinches and shoots you and the other soldiers.  As you are glazing over and passing out, you see him come up and reach towards you.

You wake, to find yourself in one of the labs strapped into a huge machine.  You feel something that doesn't entirely feel unlike wind.  And your soul is ripped from your physical body and sucked into a the machine.

You are freed from the machine and sent into your game by a young girl ghost who teaches you ghosty things.  You have to possess items in the game and use your skills of telekinetic to make the items move and operated.  The guards and other people running around the complex are frightened, which allows you to possess and take control of their body.

You have to take control of certain people, animals, and items at certain times and do certain tasks in order to escape, save others, and hopefully rejoin your body.

The game starts out as a first-person shooter (FPS) but quickly retasks into a puzzle/strategy.  There is your share of shooting, but you also have to know when to possess or talk, instead of kill.

Very interesting game, very unique.  I'm renting it now.  Seems to be good, but I just don't go around spending $50 on a game.  Not for small children, which is why it is rated M-Mature.