To participate, download the free Denny’s mobile app (available for Android and iPhone — click through the iPhone screenshot to download if you’re reading on your phone; hit the QR for Android) and check in at Denny’s locations across the country from the app. The first diner to check in at a location in each of the 50 United States will win the grand-slam prize — Grand Slams for life.
Dedicated diners can take on the challenge alone or team up with two other friends to tackle check-ins together, where they will win free Grand Slams for a year for completing the contest.
The challenge will be live on the app for one year, and for every check-in during this time users will unlock a digital state souvenir and a variety of badges that deliver exciting rewards, special in-store offers and redeemable coupons.