Rabbi Shimon on Instagram: "The card game Spider Solitaire (often just called “Spider”) does not have a definitively credited single inventor. Most sources say that it was invented by Geoffrey Mott‑Smith.  Here’s a breakdown of what we know: • The Wikipedia article on the game states “Spider … invented by Geoffrey Mott-Smith and is played the same way as Spiderette.”  • However, other sources say the history is murkier: for example, one history site says the first mention of Spider‐type rules