Hi everyone! 👋 I'm Laurent, a school IT worker and dad of two kids in France. I built Calcul Mental Challenge because every math app I tried for my kids was either full of ads, too basic, or paid after 5 minutes. So one Sunday afternoon, I started coding a simple multiplication quiz. My son loved it. Then he wanted to play against his sister. Then against his class. Then against the school next door. Fast forward to today: 13 operation types, 10+ game modes, 1v1 duels with ELO ranking, Battle Royale up to 32 players, and "School Wars" where entire schools compete weekly. Teachers use it too — they can run a classroom session in 30 seconds via local network, get detailed reports per student, and even pit two classes against each other with "Class Battle". The whole thing is: - 100% free, no ads, no tracking, no email required - Available in French, English, Spanish and Chinese - Built with vanilla JS (no framework), Web Audio API for sounds - 14,000 lines of code, one developer - Available on Windows, Mac, Linux, Android & iOS A teacher told me: "My students love it, they can't stop wanting to compete against each other." That's the best reward. I'd love your feedback! Try the Expert mode (zero mistakes allowed) — it's surprisingly addictive even for adults 😄

Calcul Mental Challenge par Studiophel

Free mental math game for students — CE1 to high school

Free mental math game for students — CE1 to high school