A 2–Minute Journey into Your Computational Brain.
Add, Subtract, Multiply, Divide, Win, Lose, Improve, Impress.
Pick how long you want to play. Practice rounds never affect your high scores or the global leaderboard — they are just for warming up.
Choose the rules. You can come back here any time.
Same questions, same clock. No peeking at Player 1's answers!
Play a round and your latest result will live here.
The clock is stopped. Take a breath.
Your unfinished score will not be saved.
Easy starts at Level 1, Medium at Level 3, and Hard at Level 5. Harder levels also pay more per answer — Easy ×1, Medium ×1.5, Hard ×2.2 — so every difficulty competes on the same leaderboard.
Practice lets you play a 30-second, 1-minute, 2-minute or 5-minute round at any difficulty. Practice rounds are never saved to your high scores or the global leaderboard, so use them to warm up freely. Only 2-minute solo rounds started with Play or Daily challenge are ranked.
Pick a name for the leaderboard. Everything you have scored on this device comes with you.
No password, ever. Your email is only used to sign you in — it is never shown on the leaderboard.
You are signed in and your scores are saved to the cloud.
This is the only thing other players see. Two to sixteen characters.
You opened this link in a different browser to the one that requested it. Enter the address you used and we will finish signing you in.