What's New

Added tutorial, and changed colour scheme to dark mode.

App Description

The classic parlour game with a twist, you can see how the computer is storing answers as you go along.

The idea is that you "teach" your iPhone how to play the game, and see how the data is stored in a binary tree.

Your iPhone (or iPad) learns from your answers and stored them on your phone, becoming more and more intelligent over time.

A wonderful education tool for learning about binary trees (look at the worksheet pack on www.studeapps.binarytrees) for full information about how this App helps you to learn about this important computer science concept.

iPhone Screenshots

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20 Questions screenshot 1 20 Questions screenshot 2

iPad Screenshots

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20 Questions screenshot 3 20 Questions screenshot 4

App Changes

  • May 31, 2017 Initial release
  • June 14, 2019 New version 1.01