Television shows, in prime time, make a huge deal out of reaching the milestone of 100 episodes, and any multiple of that, getting as high as 200 or 300, is a hugely successful achievement in the competitive world of television. So give Let’s Make a Deal a big tip of the hat: Today it celebrates its 1500th program. And to mark the occasion, Deal model Tiffany Coyne introduces a brand new game, “Winfall,” involving colored die, foam blocks, and gravity. Check local listings.