Offer valid only from 1/13/2026 through 1/18/2026 at participating U.S. Smashburger®? locations. Pricing and participation may vary.  Offer available for purchases made in store during regular business hours. Store hours may vary. Offer for a $3 regular size shake in any available flavor (not including applicable taxes). For in-store orders, must mention offer during checkout to redeem offer. No limit on number of coupons that may be redeemed per customer and per transaction.  Discount does not apply to any applicable sales tax. Cannot be used in conjunction with any other offer, promotion, or discount. Not valid on previous purchases. Not valid on orders with third party delivery. No cash value (unless prohibited by law, then cash value is $.005).  No substitutions.  No rainchecks.  Company reserves the right to withdraw or change the offer’s terms and conditions at any time, at Smashburger’s discretion, and without notice.  While supplies last.  ©? 2026 Smashburger IP Holder LLC.  All rights reserved.