1.Prepare brownie mix according to package directions and cool completely. Cut into 1 inch squares.
2.In a large bowl, combine pudding mix, water and sweetened condensed milk. Mix until smooth, then fold in 8 ounces whipped topping until no streaks remain.
3.In a glass serving dish, place half of the brownies, half of the pudding mixture and half of the 12 ounce container of whipped topping. Repeat layers. Refrigerate 8 hours before serving