You can find the game at Chipotle.com/alovestorygame. After one short play through (it takes about 30 seconds or so), you'll be prompted for your mobile number and some basic info. Upon entering said info, they'll send you a mobile "buy one, get one free entree" coupon (while supplies last) that's good at any Chipotle restaurant in the US or Canada. The coupon expires 11/30/16.
The game is based on the chain's "A Love Story" short film, which you can find online here.
Photo via Chipotle.
