After downloading their app (Apple iOS or Google Android) and log into your free Craver Nation reward account, you can get a free White Castle food offer.
Once logged in, you must select your local White Castle in the app. Once you do so, a new blue banner will appear for “Craver Nation Special Offers & Deals.” You won't see the banner until you select your local White Castle! The banner vanishes if you don't quickly click on it too, but you can make it reappear by reselecting your another local restaurant.
Once you do these steps, you'll get some coupons, one of which is the free original slider combo! These free food offers rotate almost weekly – last week the offer was for a free 6pc chicken wings and before that I was offered free cheese sticks.