The Recreation Deck Games
The recreation deck is shown several times in TMP. Decker demonstrates a few of the games in the room for the Ilia probe. But do we know what the games are called or what the object of each is? I don't remember seeing similar games at any other time during TOS or the other series. And the post-TMP novels I've read don't mention them.
"Many things seem clever to an imbecile." --Captain Thelin th'Valrass, USS Enterprise-- "The Chimes at Midnight"