Guess the square, beat the clock.
You are shown a number. Type its square and watch the live square root guide you higher or lower until you nail it. Four difficulties, custom rules, decimal targets and head-to-head stats with friends.
Live feedback
The square root of every keystroke updates instantly, so you can steer your guess.
Custom rules
Digit limits, pinned digits, decimal targets and guess limits.
Friends and chat
Add friends, compare stats and talk strategy in real time.