It starts innocently.
You just want to see if you can name all 50 US states. You can. Mostly. You blanked on Delaware. You always blank on Delaware.
Then you try the capitals. Then every country in Africa. Then every Oscar Best Picture winner since 1927. Then every #1 hit from 1985. Then every Premier League champion. Then it's 2am and you've learned more about the periodic table than you did in three years of high school chemistry.
Sporcle has over 700,000 quizzes. Almost all of them made by regular people who thought "there should be a quiz for this." There is a quiz for everything. Every possible niche, obsession, and obscure corner of human knowledge.
No ads that block the quiz. No sign-up wall. Just a text box, a timer, and the slow realization that you know considerably less than you thought you did.
The competitive mode where you race other players is genuinely dangerous. You've been warned.
Start with your favorite subject. Immediately humble yourself. Come back tomorrow.