Win an Xbox 360 4GB with Kinect in our Greatest Gadget tournament!

Kinect for Xbox 360 is looking to shake up the gaming world this Christmas and we've got a brand spanking new Xbox 360 4GB with Kinect sensor to give away.

Kinect for Xbox 360 brings games and entertainment to life in extraordinary new ways, no controller required. While everyone else puts more gadgets and gizmos into your hands, Kinect removes the last barrier between you and the experiences you love. Simply step in front of the sensor and Kinect recognises you and responds to your gestures. See a ball? Kick it. Want to watch a movie? Say, "Xbox, play." Want to join a friend? Whether they are across the room, across the street or across the globe, connecting in a whole new way is as easy as a wave of your hand.

We've previewed Kinect for Xbox 360 and think it's the bee's knees. Its three cameras create a 3D model of your living room so it can tell exactly where you're moving. It's impressively detailed -- it can see if you're turning your body, or holding your hands behind your back. You can even get your friends involved, for two or more player fun, and play against them halfway across the world through Xbox Live.

The Xbox 360 Slim is the latest version of Microsoft's console, with a sleeker, slimmer design. Other new features include touch-sensitive buttons, built-in Wi-Fi and 4GB or 250GB of built-in storage for downloadable games and extra content.

If you don't win our competition, Kinect for Xbox 360 will be available to buy from 10 November. For those wanting to immerse themselves in the new world of Xbox, you can purchase a bundle including the all-new Xbox 360 4GB console, the revolutionary Kinect sensor and Kinect Adventures game packaged together for £249.99 (RRP).

To be in with a chance of bagging this beautiful bundle, you need to enter our Greatest Gadget of the 21st Century competition. Pick the gadgets you think will win the matchups in each round of our knockout contest. Readers will vote for their favourites and each week we'll reveal the tech that has made it through to the next round.

The tactical genius who spots the most correct winners throughout -- and you'll need some foresight to predict five rounds ahead -- will win the all-new Xbox 360 4GB console, Kinect sensor and Kinect Adventures bundle.

The competition opens today and you have to make your picks by 7 November. If you vote in the competition you'll also be entered into our other Greatest Gadget prize draw. There's an FAQ here and full terms and conditions are available here.