Free cheeseburgers! Where to find the meal deals for National Cheeseburger Day Tuesday

Tuesday is one of the cheesiest days of the year.

Sept. 18 is the made-up holiday of National Cheeseburger Day, and restaurants are celebrating with discounts and free burgers.

Download the chain’s new Wayback App by Sept. 17 for a National Cheeseburger Day buy-one-get-one free deal Sept. 18. Also earn a free classic burger after making your first in-app purchase and earn other freebies.