The code also works for in-store purchases, though not for orders placed through Shake Shack’s website. Today, Dec. 17, you can grab a free SmokeShack burger with a purchase of $10 or more.

Shake Shack boasts a robust menu of burgers (including vegetarian options), chicken sandwiches, crinkle-cut fries and, of course, shakes and frozen custard. Just in time for the holidays ...