Prepare pudding using directions on the box.
Add whipped topping to pudding, folding gently.
In a large baking dish, layer starting with graham crackers, then pudding mixture, more crackers, more pudding, then top with another layer of crackers. (You’ll have to break crackers up to make them fit edges and corners.) You should have 3 layers of crackers and 2 of pudding mixture.
Remove the lid and foil from the icing. Melt in microwave for 1 minute 10 seconds. Then pour over top layer of graham crackers. Smooth if necessary. Chill at least 3 to 4 hours, but preferably overnight for best results.