Crush oreos, set aside 1/4 cup to use later, spread in bottom of 13x9x2 pan. Beat cream cheese, splenda, and 2 tablespoons mild until smooth. Fold in 1/2 of the cool whip. Spread mixture over oreos. Be careful, some of the oreos may get mixed into spread, can't be helped.
Mix white chocolate pudding with 1 1/2 cups milk, will be thick, spread over cream cheese layer. Mix chocolate pudding with 2 cups milk and spread over white chocolate. Let set approximately 10 minutes, then spread remaining cool whip over pudding and sprinkle remaining oreos. Let set until firm, at least 30 minutes.