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["PREPARE and bake cake mix in 13x9-inch baking pan as directed on package.", "Cool completely.", "Invert cake onto large platter; remove pan.", "Using a serrated knife, cut and scoop out a shallow rectangle from center of cake, leaving a 2-inch border of cake on all sides and a thin layer of cake on the bottom.", "Reserve removed cake for snacking or other use.", "STIR boiling water into dry gelatin mix in large bowl at least 2 minute until completely dissolved.", "Stir in cold water.", "Refrigerate 1-1/4 hours or until slightly thickened (consistency of unbeaten egg whites). (Shortcut: For a quick-set gelatin, simply add 4 cups ice cubes to the dissolved gelatin mixture in place of the 1 cup cold water; stir 8 minute or until gelatin begins to thicken (spoon drawn through leaves a definite impression).", "Remove any unmelted ice.", "Pour thickened gelatin into center of cake.", "Refrigerate 3 hours or until set.", "FROST borders of cake with whipped topping.", "Decorate with remaining ingredients as desired to resemble a swimming pool.", "Store leftover cake in refrigerator.", "Fun Idea: Insert bite-size fish-shaped and octopus-shaped chewy fruit snacks into gelatin ""pool"" before refrigerating for an added treat!"]
