• Work hard, play hard!


We just released two new missions! So... what’s this "work" thing you’re talking about? Let’s play!

Restricted sum
Our new calculator has censorship and it does not accept some words. You should trick this thing and write a program to calculate the sum of numbers. Challenge your creativity and come up with a solution to fit this mission's specs.

Palindromic Palindrome
Can you write a palindromic program with a checkio(s) function that checks whether s (a string) is a palindrome? You're not allowed to use "#". Give it a try!

… and meet our autumn star player!
In our recent newsletter, we praised Amachua for his active role in the CheckiO community - and rightly so! Today we'd like you to learn a little more about our star player (and find out which game character he would be, if he could choose)!

Happy coding!

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