Coding Ireland STEM Report 2024 Have Your Say
Scratch Artificial Intelligence
60 mins
220 points
What you need:

Scratch AI Rock, Paper, Scissors Game

Create a fun Rock, Paper, Scissors game using Scratch and Google Teachable Machine!
Learning Goals Learning Outcomes Teacher Notes Lesson Files

1 - Introduction

In this lesson, you will create a fun Rock, Paper, Scissors game using Scratch and Google Teachable Machine.

You will learn how to use your Teachable Machine Image model with rock, paper, and scissors hand gestures to play against the computer.

If you don't have a Teachable Machine Image model, don't worry! You can use the provided model.

2 - Setup Scratch and TM2Scratch

Go to and start a new Scratch project and delete the Cat sprite.

Then, add the TM2Scratch extension by clicking on the Extensions button at the bottom left corner of the screen and selecting TM2Scratch. This extension allows you to use Google Teachable Machine Image models in your Scratch projects.

When you add this extension, it will automatically try and use your computer's camera. If necessary, click on 'Allow' to give it permission to use your camera. You should see what the camera is showing in the stage area.

3 - Add a Sprite

Add a new sprite to the project that will represent the computer's choice in the game. You can choose any sprite you like, but for this example, we'll use the 'Gobo' sprite.

4 - Create Variables

Create three new variables:

  • playerChoice - to store the player's choice.
  • computerChoice - to store the computer's choice.
  • result - to store the result of the game.

5 - Randomize Computer Choice

In this step, you will add code to your sprite to randomly set the computer's choice to 1, 2, or 3. These numbers will represent the computer's choice of rock, paper, or scissors, respectively:

  • 1 = Rock
  • 2 = Paper
  • 3 = Scissors

Add the following code to your sprite:

when green flag clicked set [computerChoice v] to (pick random (1) to (3))

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Copyright Notice
This lesson is copyright of Coding Ireland. Unauthorised use, copying or distribution is not allowed.

Scratch is developed by the Lifelong Kindergarten Group at the MIT Media Lab. It is available for free at
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