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Instruo

Arcade

Number Guess

Find the hidden number from 1 to 100 in seven guesses.

Play immediately. No account required.

Find the hidden number in seven guesses. Every result narrows the search.

A playful number guessing scene with a glowing target and numbered tiles

Signal room

Finding a fair number

Rules

  1. Enter a whole number between 1 and 100.
  2. Each guess gives a higher or lower hint.
  3. Solve the number in seven attempts.

A brief history

Higher-or-lower guessing games are a classic form of paper-and-pencil play. Their small search space makes probability and binary-search ideas easy to feel through play.

Privacy

The target and guesses stay in this browser tab.