Bake cake according to the package directions, cool.Prepare pudding according to package directions; set aside. Crumble cake; reserve 1/2 cup. Place half of the remaining cake crumbs in the bottom of a 4 1/2 or 5 quart trifle dish or decorative glass bowl. Layer with half of the coffee, half of the pudding, half of the whipped topping, and half of the crushed candy bars. Repeat. Top with the reserved cake crumbs. Refrigerate 4-5 hours before serving.