Prepare cake as directed on package in a 13x9 inch pan.

Remove from oven and immediately poke holes into cake around 1 inch apart. You can use the handle of a wooden spoon for this or skewers.

Combine Pudding Mix and Sugar in large bowl, gradually stir in Milk.

Beat on low for 1 minute with a mixer.

Pour half of mixture over warm cake.

Allow remaining pudding mixture to thicken slightly, then spoon over cake.

You can stop at this point and store in the refrigerator or, you can top with Cool Whip.

Store in refrigerator and is best served cold.