Bake chocolate cake as directed on box. Let completely cool.
Prepare pudding as directed. Chop seperate and put in seperate bowls, oreos, reesee cups,and walnuts
When cake is completely cooled tear up into pieces and put in bottom of a clear serving pan. Layer the rest of the ingredients as follows. Hot fudge,oreos, pudding, resee cup pieces,spread cool whip on top and garnish with chopped walnuts.Can put a little hot fudge designs on top. Let chill for 30 minutes.Use a scoop to serve. Then enjoy the chocolate high.