I know we're a little late, but the contest is still ongoing, at least until Sunday, that is. Mr Sark (the man seen on X-Play) says,

"Fire up your Xboxes [I">Halo nerds, it's time for Sarkathlon 3![/I"> That's right, [I">X-Play's own gaming pro Mr Sark has thrown down the gauntlet. Are you up for the challenge? If you think you have the cunning skills and gritty determination it'll take to tackle his special designed Halo 3 obstacle course, then you should watch the video below to find out how to get in the game.[/I">
He'll explain it all, but here's the short version: Mr Sark has lovingly built a course that will blow your mind in the sky above Sandbox (so you'll need to download the Mythic Map Pack if you haven't already). You go to Bungie.net, download the goods and then use your amazing [I">Halo skillz to figure out Sark's mad genius. Once you've captured your fastest time, add the file to your share and email the link to mrsark@g4tv.com.[/I">
I know you're wondering: besides the eternal glory and bragging rights that come along with being the Sarkathlon 3 champion, what else can I win? A bangin' Game of the Year Xbox 360 Bundle, that's what! So hurry, because[B"> Sarkathlon 3 ends at midnight on May 10th. [/B">
Good luck!"
So go get going on your run and win a new xbox 360!