Chipotle Mexican Grill is bringing an educational twist to a new mobile-optimized game and sweepstakes that enables entrants to receive a buy one, get one free offer that is redeemable only on smartphones. The dining chain’s latest marketing campaign highlights the differences between Chipotle’s ingredients and those commonly used by other fast food brands. Chipotle is continuing its mobile streak by rolling out a complementary mobile-optimized game and offering players a special coupon to redeem with their mobile devices in-store.