Tropical Orange Pretzel Salad

Name: Tropical Orange Pretzel Salad
Prep time: 20 min
Cook time: 30 min
Total time: 50 min
Cuisine: American
Ingredients: 2 cups finely crushed pretzels; 3/4 cup butter (melted); 3 tablespoons sugar; 8 oz cream cheese (1 box cream cheese, softened); 1/2 cup sugar; 2 cups whipped topping; 3.4 oz orange gelatin (2 boxes); 1 cup boiling water; 16 oz crushed pineapple (1 large can crushed pineapple with juice); 11 oz mandarin oranges (1 can mandarin oranges, drained)