Crush 25 cookies; set remaining cookies aside. In a large bowl, combine cookie crumbs and butter. Press onto the bottom of a greased 10-inch springform pan. Freeze for 15 minutes. In a microwave-safe bowl, heat 3/4 cup hot fudge topping on high for 15-20 seconds or until pourable; spread over crust. Arrange reserved cookies around the edge of pan. Freeze for 15 minutes. Spread vanilla ice cream over fudge topping; freeze for 30 minutes. Spread with chocolate ice cream. Cover and freeze until firm. May be frozen for up to 2 months. Remove from the freezer 10 minutes before serving. Remove sides of pan. Warm remaining hot fudge topping; drizzle over top.