Math practice · reimagined
Factorial
Turn Factorial into a fight you actually want to win. Every problem is an attack — solve it faster than your opponent and you land the hit.
Ages 4–99+ · no download · plays in your browser · 23 languages
How it works
Factorial
Pick a fighter, choose Factorial, and trust your numbers. The faster and cleaner you solve, the harder you hit — from gentle early grades all the way to Olympic-level challenges.
The little "!" means multiply every whole number from your number down to 1.
4! = 4 × 3 × 2 × 1 = 24. It counts how many ways you can line things up: 4 different toys can be ordered in 24 different rows. Notice how fast it grows!
Multiply the countdown and type the result. Some problems divide one factorial by another, like 6! / 2! — work each countdown out, then divide.
More math to master
— Quick answers —
Factorial: the short FAQ
- Is Factorial free to play?
- Yes. Factorial is free to play right in your browser — the whole curriculum, no download, no signup. Paid plans later unlock the full fighter roster, every stage and saved progress.
- Who is Factorial for?
- Anyone from 4 to 99+. The early grades stay gentle for beginners, while the higher tiers will make even the confident sweat.
- Do I need to download anything to play Factorial?
- Nope. Factorial runs in any browser, on a laptop, tablet or phone.
- Can Factorial be used in the classroom?
- Absolutely. Teachers run Factorial with a whole class and track who's improving — see the schools plan for per-student pricing and a teacher dashboard.