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NO PURCHASE NECESSARY. Void where prohibited. Legal residents of the 50 US or DC who are 18 or older. Begins March 14, 2018 at 4:00 P.M. ET and ends March 21, 2018 at 11:59 P.M. ET. Limit 1 entry per person per day. To enter, and for Official Rules, odds, and prize details, visit www.usanetwork.com/unsolved/risk-sweepstakes/rules. Sponsors: Universal Television Networks and NBCUniversal Media, LLC.