In a medium bowl, mix the chocolate cake mixture with the liquid ingredients well for 5 minutes or according to the instructions shown on the package.
Add the cake mixture in a rectangular mold lined with oil and flour and then insert it in a preheated oven at 170 degrees for 40 minutes, take the cake out of the oven and leave until it cools.
Wrap a rectangular mold with plastic stretch, and cut the cake mold in the form of cross slices, so that the thickness of one slice is 3 cm.
We put the first slice of cake in the mold, then add the Cadbury Dairy Milk ice cream, then add the chocolate bars.
Add another layer of cake, then add Cadbury Dairy Milk ice cream, then add colored chocolate balls.
Add the last slice of cake, then Cadbury Dairy Milk ice cream, cover the mold with plastic sheeting and then put it in the freezer for a period of at least 6 hours.
Take out the mold from the freezer, then cover the cake with melted chocolate and garnish with chopped hazelnuts.