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About this tool
Guess the secret number between 1 and 100. Get hints like higher or lower and try to beat your best score.
The Number Guessing Game picks a random secret number in your chosen range and tells you after each guess whether the target is higher or lower, until you find it or run out of attempts. Three difficulties set the range and the budget: Easy is 1–50 in 10 guesses, Medium is 1–100 in 7, and Hard is 1–200 in only 6. It is a hands-on way to practise binary search — halving the remaining range each turn is the strategy the guess budgets are built around.
Open Number Guessing Game on AltFTool — it loads instantly in your browser.
Add your input to the workspace.
Adjust the options until the result looks right.
Copy or download the output and put it to work.
Medium's 7 attempts match ceil(log₂ 100) exactly, so optimal play wins and sloppy play does not.
Every attempt is listed with an up or down arrow, so you can see the bracket narrowing instead of holding it in your head.
1–200 in 6 guesses is below the 8 that binary search guarantees, turning it into a calculated-risk round rather than a solved one.
Guess the midpoint of the range that is still possible, then halve again after each hint. On Medium that means starting at 50, then 25 or 75, and so on — this finds any number from 1 to 100 in at most 7 guesses, which is exactly the attempt budget.
It depends on difficulty: 10 guesses on Easy (1–50), 7 on Medium (1–100) and 6 on Hard (1–200). The counter at the top shows attempts used and attempts remaining as you play.
No. Covering 1–200 with certainty needs 8 guesses under binary search, and Hard gives you 6, so it can only cover 64 possibilities with guaranteed play. Winning requires the secret number to fall inside the bracket you happen to be probing — good play raises the odds but cannot guarantee it.
Your best score is tracked for the current session and shown in the third stat card, updating whenever you win in fewer attempts than before. It resets when you reload the page — nothing is stored on a server or in your browser.