1 (18.8 ounce) package chocolate cake mix
1 (3 ounce) package instant vanilla pudding mix
1 (3 ounce) package instant chocolate pudding mix
1 (3 ounce) package instant chocolate pudding mix
1 (3 ounce) package instant chocolate pudding mix
3/4 cup sugar
Preheat oven to 350 degrees F (175 degrees C). Prepare a 9x13 inch pan by lightly oiling the bottom and sides.
In a large bowl, stir together cake mix, pudding, and pudding mix. Beat in sugar until well blended. Spread evenly into the prepared pan.
Bake for 75 minutes in the preheated oven, or until a toothpick inserted into the center of the cake comes out clean. Cool before removing from pan. Chill in refrigerator until serving.