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 ❤️ 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