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Prepare cake mix and bake according to package instructions.
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Let cool for about 10 minutes. Use the handle of a wooden spoon to poke holes all over the cake. Pour the marshmallow sauce on top and use a spoon to make sure the cake is covered. Cool completely.
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Spread the Cool Whip over the cooled cake. Sprinkle marshmallow bits, chopped Hershey's bar, and chopped graham crackers on top.