Frequently Asked Questions
Everything you need to know about Calcul Mental Challenge
Everything you need to know about Calcul Mental Challenge
Yes, it is completely free, with no ads and no in-app purchases. Available on Windows, Mac, Android and iOS.
The teacher installs the app on their computer, creates a room in 30 seconds, then students join using the code displayed via the school's WiFi. Real-time leaderboard, CSV/PDF export, detailed report with each student's errors. See the full tutorial.
From CE1 (1st grade) to high school (10th grade) plus a Competition mode. 10 levels that follow the national curriculum: simple addition in CE1 (1st grade), multiplication tables in CE2–CM2 (2nd–4th grade), fractions and powers in middle school.
The Table Training mode lets you choose the operation (addition, multiplication, division), the table (1 to 15) and the game style. A badge is unlocked for each table completed without errors.
A teacher can pit two of their classes against each other for a week. Each day has a different theme (tables on Monday, fractions on Saturday…), 3 attempts per student. Each student's best score contributes to their class total. Learn more.
A competitive mode where schools compete against each other. Once 3 players from the same school join, the school is automatically registered. Weekly leaderboard with Primary / Middle School / High School categories.
Yes. In classroom mode, data stays on the school's local network. GDPR compliant with data export and deletion. No cookies, no ad trackers. See the privacy policy.
Yes. Solo mode works entirely offline. Only multiplayer modes and online leaderboards require an internet connection.
Each player receives an 8-character recovery code (visible in their profile). Simply enter it on the new device to restore your progress, badges, records and settings.
Windows (10/11), macOS (11+), Linux (AppImage, .deb), Android (8+) and iOS (16+). Automatic updates on desktop. Download.
A parent creates a family (with a name and a label like "Mom, Dad, Step-Mom, Guardian…"), invites the other parent through a code, and adds up to 6 children via QR scan or recovery code. Parents can see the children's progress, give them individually targeted homework, and help them recover their account if they lose their code. Family data is visible only to family members, never publicly. New in v0.4.5.
A solo mode that starts at CE1 (1st grade) with a 60-second timer. Every 5 correct answers, the player climbs one school level (CE2, CM1, CM2, 6th grade … up to Concours). The score is multiplied by the level reached, and a weekly worldwide leaderboard rewards the best players. 7 academic badges to unlock from "First step" to "Prodigy". New in v0.4.5.
A new game style with a reverse timer. Players start at 60 seconds, every correct answer adds 3 seconds, every mistake removes 5. The game continues until the timer hits zero. 5 dedicated badges (Survivor, Tenacious, Master, Legend, Marathon runner). New in v0.4.5.
Coop mode pits two players against a boss they must defeat together. Version 0.4.5 adds 4 new historical bosses next to the original Dragon of Numbers: Sophie Germain (multiplications), Ada Lovelace (missing number), Isaac Newton (subtractions) and Albert Einstein (complements). Each boss enforces its own theme of questions and tolerates fewer mistakes. 6 new badges, including "Pantheon of Maths" for players who defeat all 5 bosses. New in v0.4.5.
The teacher launches a single-elimination tournament in the classroom. Students play asynchronous 1v1 matches with the same questions, with 48 hours per round to fit around school schedules. Absent students are auto-forfeited. 3 badges (Challenger, Finalist, Champion) and an exclusive "Champion's Crown" avatar for the winners. New in v0.4.5.
From Settings → Audio → Additional music, users can download extra tracks from the server. Preview available before downloading, "Download all" button, and option to remove tracks you don't like. The catalogue grows regularly without bloating the app build. New in v0.4.5.