10 x 13 cake pan. Make cake according to directions on box.Let cool.
poke holes in cool cake with end of wooden spoon or similar size hole into cake.
mix strawberry jello with 1 cup boiling water. stir until jello is dissolved. add 1 cup big red to jello and stir.
pour jello into holes and set aside.
mix the vanilla pudding according to directions on box and pour into holes ( you have to do this quickly before pudding sets up) . after you fill holes with pudding just pour the rest of pudding over top of cake.
set cake in refrigerator until pudding has set.
after pudding has set, you cover with cool whip and set in refrigerator overnight if possible ,but long enough for cake/jello to absorb.