It appears hackers have found a way to exploit Microsoft's Xbox Live interactive quiz show http://www.xbox.com/en-US/games/1/1v100/, which has resulted in Microsoft halting the BETA phase for the software.
The quiz allowed participants to win prizes including 40" HDTVs, so it's likely until Microsoft fixes the exploit the trial will remain at a standstill.
To quote: The beta phase for Microsoft's free Xbox Live interactive quiz, in which players can win prizes, has been taken offline, presumably following the news that hackers have exploited the software.
The 1 vs. 100 beta phase kicked off in July and thousand of gamers have been competing to take home a variety of prizes including 40" HDTVs and the top prize of 10,000 Microsoft points.
From the video's caption: This is proof that gamertags with Defensive in front of their name are cheaters at 1 vs 100.
http://www.consolemonster.com/newspost.php?id=0000005824 first broke the news that a number of gamers with the word "Defensive" in their gamertags had manage to exploit the system.
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