Prepare cake batter according to package directions. Stir in 3/4 cup chocolate chips., Pour into a greased 13x9-in. baking pan. Bake at 350degrees for 35-40 minutes or until a toothpick inserted in the center comes out clean. Immediately poke holes in the cake with a meat fork or skewer. Spread caramel and fudge toppings over cake. Cool on a wire rack., Frost with whipped topping. Sprinkle with toffee bits and remaining chocolate chips. Store in the refrigerator.