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U.S. Patent No. 4,378,116 - issued to Ernö Rubik in 1983 for a "spatial logical toy"
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Has so far included content from Warsandpeas, Mr. Lovenstein, SMBC, Loading Artist, Low Quality Facts, nixCraft, ElleGray, and other interesting or provocative stuff I've random'd across on Mastodon.
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Awesome! This is probably the single most popular puzzle ever invented.
Tetris?
That's definitely in contention. Now I'm curious which is more popular. Do they have Tetris clubs, Tetris world records, and that sort of stuff?
Oh boy do they ever. Notably a teenager became the first to ever beat one version. . Many news outlets covered it.