When you're playing Xbox 360 games, you amass these points, which are added to your profile, for completing certain objectives in the games. The points are cumulative and don't really do much except let people know how many games you've played, and to what completion. There are usually 1,000 points per full game, spread out over any number of challenges.

But, say you want to quickly beef up your Gamerscore. You could rent (I wouldn't bother buying it) Avatar: The Last Airbender: The Burning Earth, then you can run over to the left as soon as the game begins and start hitting enemies with your ranged attack. As long as you don't get hit you keep your combo multiplier going, and all you need to pass all of the challenges is to get the combo meter to 50. This video (not by me) explains things a whole lot better than I can.

Of course, this is kind of cheap, but it's not strictly cheating. And who knows, the game might not actually be terrible, but once I got all of the achievements, I put it back on the shelf.