So I was looking at some TOS screencaps over at TrekCore. "The Alternative Factor" Screencaps Page Five http://tos.trekcore.com/gallery/albums/1x27/The_Alternative_Factor_118.JPG A Rec Room scene with the familiar Tri-Dimensional Chess we've seen many times. But across the room I noticed a 3D Checkers game. Huh. Over forty years later and I'm still finding new things.