If you have a Microsoft Xbox 360 and are an Xbox Live Gold member, then you can get the download the game "MX vs. ATV Alive" for free. It's only available until Jan. 15.
Here's what Microsoft has to say about it: "Whether it’s track racing on motocross or Supercross, or just tearing up the off-road freestyle events, 'MX vs. ATV Alive' gives you tons of options for getting your wheels in the dirt. You can race on dirt bikes or on the titular four-wheel ATVs, each with their own physical feel and control style. And, when you’re done breaking all the records that the A.I. has set, you can race against your friends and spray mud all over their television sets in your wake (virtually, of course)."
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