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Number Guess

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About Number Guess

Number Guess is a classic deductive game where the computer picks a secret number in a range, and you guess until you find it. Each guess earns a "higher" or "lower" hint. The fewer guesses you take, the better your score. It is one of the oldest computer games ever written — and still one of the most pedagogically useful.

The secret of Number Guess is the binary search. Halving the range with every guess is mathematically optimal — it guarantees you find any number between 1 and 100 in at most seven guesses. Beginners chase numbers randomly. Better players halve. Best players halve and adjust based on the hint pattern. That algorithmic thinking is exactly the mental habit the game trains.

This Number Guess plays free in the browser with smooth touch and keyboard input. There is no sign-up, no installer and no microtransactions. Your best score (fewest guesses) is stored locally. It is one of the cleanest, calmest games on the site — a quiet deduction puzzle with no time pressure.

— How to play

How to play Number Guess

Type a number 1–100
Read the hint
Narrow it down to the answer

— Controls

Number Guess controls

Desktop (mouse & keyboard)

Number Guess uses arrow keys on desktop. The exact inputs for each action are listed in the "How to play" steps above.

Mobile (touchscreen)

On phone or tablet, Number Guess responds to tap and swipe as the steps describe — no on-screen joystick needed. Works in most modern browsers on any recent phone.

— Compatibility

Devices & browsers

Runs on

Any modern browser (Chrome, Safari, Firefox, Edge) on Windows, macOS, Linux, Chrome OS, iOS or Android. No plugin or install is required.

Offline & PWA

Once loaded, gameplay does not require a constant internet connection. GameJadoo can also be installed as a Progressive Web App from your browser's menu for home-screen access.

— Strategy & tips

How to win

Always start at the middle of the range. First guess of 1–100 should be 50.
After each hint, jump to the middle of the new range, not just one step in either direction.
Count your guesses. Seven is the magic ceiling for 1–100; aim for five or six.
Do not guess in panic at the end. The last few guesses are the most important.
Replay the same range to drill the binary-search habit until it is automatic.

— Game features

Why you'll love it

Classic higher-lower number deduction game
Built to teach binary-search thinking
Best score saved locally between sessions
Free, no download, instant in any browser

— Frequently asked questions

Number Guess FAQ

How do you play Number Guess?

Number Guess is a skill game. To get started: Type a number 1–100 The complete step-by-step controls are listed under "How to play" above.

Is Number Guess free to play?

Yes. Number Guess is free to play on GameJadoo — no charges, no in-app purchases, no sign-up.

Do I need to download Number Guess?

No. Number Guess is an HTML5 browser game — it runs directly in your web browser without any download or plugin.

Can I play Number Guess on a phone or Chromebook?

Yes. Number Guess runs in any modern browser on phone, tablet, laptop or Chromebook.

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