Number Guess
I'm thinking of a number between 1 and 100. Can you find it in the fewest guesses? You can do it in 7 or fewer with smart halving.
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Make your first guess!
The winning strategy
The fastest method is binary search: always guess the middle of the possible range. Start at 50; if the answer is higher, guess 75; if lower, guess 25 — and keep halving. This guarantees you find any number from 1 to 100 in at most 7 guesses, because halving 100 seven times narrows it to a single value. It's the same idea computers use to search sorted data quickly.
Frequently asked questions
Can I always win in 7 guesses?
Yes — by always guessing the middle of the remaining range (binary search).
Is the number really random?
Yes, picked randomly in your browser each game and never stored.
Is it free?
Completely free, no signup, plays on any device.