Chipotle Mexican Grill has created a contest to celebrate turning 20 on July 13, with 20 daily puzzles and trivia questions that will earn one person free burritos for the next 20 years. Each clue in the "Adventurrito treasure hunt" will include a video clue starring a roster of celebrity brand fans including Willie Nelson, soccer star Abby Wambach and Colorado Gov. John Hickenlooper.

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