Math practice · reimagined
Binary
Turn Binary 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
Binary
Pick a fighter, choose Binary, 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.
Computers count with only two digits, 0 and 1 — that's binary, or base 2. Each place is worth double the place to its right: 1, 2, 4, 8, 16…
To read a binary number, add up the place values wherever there's a 1. For 1011₂: the places (from the right) are worth 1, 2, 4, 8. There are 1s in the 1, 2, and 8 spots, so 8 + 2 + 1 = 11.
Add the values under each 1, and type the everyday number.
— Quick answers —
Binary: the short FAQ
- Is Binary free to play?
- Yes. Binary 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 Binary 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 Binary?
- Nope. Binary runs in any browser, on a laptop, tablet or phone.
- Can Binary be used in the classroom?
- Absolutely. Teachers run Binary with a whole class and track who's improving — see the schools plan for per-student pricing and a teacher dashboard.