• Change the World With Code!

Python 3.4.2 is Now Available

The new release features a number of bug fixes, some minor improvements and a neat little feature for Mac OS X. Let us know what you think of it in the comments on our blog!

New Missions

Help translate your favorite books into braille in the new English to Braille Translator mission!

Define national boundaries by applying the four color theorem in the Color Map mission!

Make CheckiO's Next Island

Have you ever wanted to make your own Island in CheckiO? Well, with your feedback, we can make that happen! With just two minutes of your time, you can help decide the fate of the world of CheckiO!

Welcome to CheckiO - games for coders where you can improve your codings skills.

The main idea behind these games is to give you the opportunity to learn by exchanging experience with the rest of the community. Every day we are trying to find interesting solutions for you to help you become a better coder.

Join the Game