For the first time ever, Twinkies is launching a "mystery" flavor and if you can guess it correctly, you could win a year's worth of Twinkies! You can get a box at Walmart and enter your answer as to what you think the filling is before August 1st, 2024 on the Hostess website to win. Fruity Pebbles, birthday cake, marshmallow and coconut have been some of the guesses for the mystery flavor so far.