Hour of Code

Free one-hour computer science activities for your classroom

Pick your students’ grade band to find ready-to-run Hour of Code activities from 9 Dots. Everything runs in the browser and needs no sign-up.

About 9 Dots. 9 Dots is a nonprofit that brings computer science to every elementary school student, starting in kindergarten. We deliver a fully supported, standards-aligned CS curriculum, and teachers don’t need any prior coding experience.

Choose your grade band

Grades K–4

Students design their own pixel art animal, then code a robot to paint it one square at a time. It uses code blocks, so no typing is needed.

Go to the PixelArt Activity Opens the PixelArt activity page

Grades 5–6

Students write real JavaScript in p5.js to build a working DJ deck with turntables and drum pads, then remix it with their own colors, sounds and beats.

Go to the DJ Activity Opens the DJ activity page

Our impact

In the 2025–2026 school year, 9 Dots brought computer science to thousands of students in the communities that need it most.

14,697students served

94%of our coders are students of color

74%of students identified as a coder

596teachers trained

43school partners in low-income zip codes

Data from the 2025–2026 school year.

Want to learn more about 9 Dots?

Tell us a little about yourself and we will follow up with ways to bring computer science to your school or family.