The essence of Catch-22 is that if you are concerned enough for your safety to ask to be declared insane, then you are sane enough to go into battle. The essence of Catch-23 is that if you stop breathing, you can't write anymore.
Joseph Heller was never played in a game.
He was called "The Master of Malaprop", which is where you purposely use the wrong word in a sentence, making it hilarious. For example, saying "You could have knocked me over with a fender." We assume the word "hilarious" meant something different back in the 60's.
(d) November 7th, 2020