Teach Computer Science with Wonder & Play

Free curriculum combining digital learning with physical outdoor activities for children ages 4-12. Used by educators in 28+ countries worldwide.

Getting Started

Download Teacher Journal

Complete guide with lesson plans, reflection prompts, and classroom activities

Download PDF

Download Student Passport

Activity passport for students to track their learning journey

Download PDF

Watch the Introduction

10-minute overview of the Hello Ruby teaching philosophy

Watch Video

Start with Playground Activities

Screen-free outdoor activities perfect for first-time teachers

Browse Activities

Curriculum: Love Letters for Computers

13 comprehensive episodes covering Computer Science AND Math fundamentals through video lessons, hands-on activities, and reflection exercises.

Computer Science (10 Episodes)

Episode 1: Computer Science →
Episode 2: Computational Thinking →
Episode 3: Code →
Episode 4: Data & Algorithms →
Episode 5: Scratch →
Episode 6: Hardware →
Episode 7: Computer Systems →
Episode 8: Networks →
Episode 9: Machine Learning & AI →
Episode 10: Diversity & Equity →

Math (3 Episodes)

Math 1: Counting & Numbers →
Math 2: Geometry & Shapes →
Math 3: Puzzles & Problem-Solving →

Activities

Combine digital and physical learning with our collection of activities. Filter by age, difficulty, indoor/outdoor, and more.

Digital Activities

Interactive exercises for learning CS concepts on computers and tablets

Browse Digital

Outdoor Activities

Screen-free playground games teaching algorithms, data structures, and more

Browse Outdoor

Hybrid Activities

Flexible activities that work both indoors and outdoors

Browse Hybrid

Community Lesson Plans

Educators around the world have created classroom-ready lesson plans aligned with local standards.

Educators love Ruby

Mikko
"We have built our own paper computers using Hello Ruby's My First Computer exercise. The children's enthusiasm materialized as a working environment that I would compare to an anthill. The hustle and bustle was great!"
Mikko Helsinki, Finland • 10-12 year olds
Laura
"I read Ruby's story to my first graders on their very first day of school. Ruby had sent them a postcard and hidden a treasure. At home the children told that they had had the best school day ever!"
Laura Helsinki, Finland • 7 year olds
Samantha
"My students love using the My First Computer exercise. I give them a lunchbox for the computer case. When they went to school the next day, they all talked as if they were an elite group of kids that had a 'computing power' harnessed in their power lunch box."
Samantha Honolulu, Hawaii • 3-12 year olds