Bake the cake according to the directions.
Let cool for 5 minutes meanwhile mixing the caramel sauce with the condensed milk in a seperate bowl.
Using the end of a sharpie or wooden spoon, poke holes all over the cake.
Pour the caramel sauce all over the cake making sure it gets in the holes.
Pour the fudge on top of the caramel.
Top with cool whip and put it in the fridge for 1-2 hours.
Chop up some twix bars and sprinkle it over the top!