To celebrate Leap Day on February 29th, Chipotle Mexican Grill is treating its Rewards members to one free guacamole serving with any order made through their app or website using the special code “EXTRA24.” The company is also stoking up their fans with an "Extra Day, Extra Codes" challenge on Instagram through the 29th, offering participants the chance to win free guacamole for a year by finding hidden keywords in their posts. No purchase is required to win the free guac. For official rules including how to enter, entry limitations, and detailed prize descriptions, visit chipotle.com/extra-day