To enter, all you need to do is tune into Sword Art Online, airing during the Toonami block on Cartoon Network at 2:00 AM EST/PST between October 20th and 27th. You'll see a keyword immediately after the show. Take the keyword, fill out the entry submission at the Aniplex USA official page, and hope like heck that you won!
Official details can be found at the contest page here. If you win the 3D viewer though, just don't let yourself get sucked into Aincrad or anything. We don't know what that thing is capable of.
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