Preheat oven to 350 degrees F.

Place pretzels in a large ziploc bag and crush with a rolling pin. Transfer to a bowl and add sugar and melted butter, stirring to combine. Press into the bottom of a 9x13-inch baking dish with the bottom of a measuring cup. Bake for 10 minutes, then remove from oven and cool completely.

In a large bowl, beat the cream cheese and sugar with an electric hand mixer until smooth. Fold in the Cool Whip with a spatula, then spread over the pretzel crust in an even layer, taking care to press all the way to the edges of the pan to create a seal that will prevent the jello layer from seeping through. Chill in the fridge for 30 minutes.

While the middle layer chills in the fridge, microwave the water for 3-5 minutes, until boiling, then stir jello into the hot water until dissolved. Add frozen raspberries and stir.

Once the cream cheese layer has chilled and the jello has cooled, gently pour the raspberry jello mixture over the cream cheese layer. Refrigerate until the jello is completely set, around 2 to 3 hours.

Slice into squares and serve.