Step 1: Go to Burger King and purchase some food. Save the receipt.

Step 2: Write generated code on the back of the receipt. Receipt

Step 3: On your next visit to Burger King order a drink, fries (any size) and get a free Whopper or Chicken Sandwich.

Step 4: Save your new receipt and repeat Steps 2-3 as often as you like. Rinse Lather Repeat.