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Guess My Number

Source Institutions

    Computer Science Unplugged

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Guess My Number

In this game, learners experience how computers divide a big problem into many smaller ones and how they use binary "yes"/"no" questions. Learners play a game similar to 20 questions to guess a number with the strict rule that they can only answer whether the secret number is greater than or equal to a guessed number. This game explores the main principles of Boolean Logic. Activity includes step-by-step instructions with pictures, an explanation of the computer science behind the activity, and optional challenges.

Quick Guide

Preparation Time:
Under 5 minutes

Learning Time:
5 to 10 minutes

Estimated Materials Cost:
1 cent - $1 per group of students

Age Range:
Ages 8 - 18

Resource Types:
Activity, Game


Materials List (per group of students)

  • At least 2 people
  • A pen or pencil
  • Two or three pieces of paper


  • Engineering and Technology
    • Computing
      • Computer Science
      • Information Systems
      • Information Technology

Informal Categories

  • Computers
  • Games


Components that are part of this resource:

This resource is part of:

Access Rights:

  • Free access



Funding Sources:

  • University of Canterbury
  • Google
  • Microsoft