Part of the ongoing Xbox Live Rewards campaign, on Xbox.com fans have been invited to play the Xbox LIVE Rewards Gamer IQ Trivia challenge {link no longer active} and see how their knowledge and expertise about their favorite games stacks up.  Each answer enters you into a contest eligible to win 10,000 Microsoft Points Grand Prize, weekly 4,000 Microsoft Points prizes, and instant prizes up to 1,000 Microsoft Points.  Exclusive to members registered for Xbox Live Rewards, gamers can play every day through May 15th and rack up more sweepstakes entries for more chances to win.  Questions are focused specifically on gameplay and story related details about games like Gears of War and Call of Duty.