Place cake mix, pudding, eggs, water oil, ice cream and hot fudge sauce into stand or electric mixer.
Beat on low then medium for about 1 minute 30 seconds or until well combined and thick.
Divide evenly into 4 (9 inch) cake pans that have been generously sprayed with cooking spray.
Bake for 15-20 minutes or until toothpick comes mostly clean from center.
Let cool completely, loosen sides with a plastic knife then remove from pans.
Place bottom layer onto a cake stand, spread with your favorite chocolate frosting….repeat until 3 layers are frosted leaving 4th layer on top. Frost remaining top and sides of cake with frosting.
Take a vegetable peeler and peel chocolate bloc to get curls, about 2 cups worth. Press curls onto sides of cake and serve room temperature or refrigerate to chill.