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

Level Beginner Suggested for grades K–4
The PixelBots activity: a pixel art grid on the left and the code blocks on the right

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
Level Intermediate Suggested for grades 5–6
The DJ Studio: step-by-step directions, the code editor and a running DJ deck

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

Learn Computer Science

In both Hour of Code activities, students learn real Computer Science concepts by coding.

SequencingBeginnerIntermediate
The order in which a computer executes code, one line at a time.
IterationBeginnerIntermediate
Repeating a process to improve a solution.
LoopsBeginnerIntermediate
A programming tool that repeats a sequence or pattern of instructions.
ConditionalsIntermediate
Code that runs only when a condition is true.
DebuggingIntermediate
The process of finding and fixing errors in code.
AbstractionIntermediate
The practice of hiding complex details and showing only the essential parts.

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.