CodinGame

CodinGame is a challenge-based training platform for programmers where you can play with the hottest programming topics.

Free Web

hackerrank.com

A fun social platform for hackers to solve interesting puzzles, build quick hacks, code game bots and collaborate to solve real-world challenges.

Free Web

Coderbyte

Coderbyte is a place built for anyone to practice and perfect their programming skills. Challenges are added almost every day so you can work on applying your algorithmic thought process on any problem you want at anytime.

Freemium Web

Project Euler

Project Euler is a series of challenging mathematical/computer programming problems that will require more than just mathematical insights to solve.

Free Web

CodeFights

Duel with friends and foes in head-to-head programming battles!.

Free Personal Web

Codewars

Achieve code mastery through challenge. Improve your skills by training with others on real code challenges Kata In our dojo, kata are real code challenges...

Free Self-Hosted

The AI Games

Develop your coding skills and practice them by competing with hundreds of players worldwide. Code your own bots in your preferred language and join the various...

Free Web

Codechef

CodeChef was created by Directi as a way to continuously challenge and engage the developer community. Our goals are to provide a platform for practice, competition and...

Free Web

Topcoder

Topcoder provides members opportunities to demonstrate their expertise, improve their skills, and win cash, while helping real world organizations solve real world problems.

Free Web

Code Arcade

built by codefights, code arcade challenges players to solve programming tasks to complete game levels. it's a fun way to hone...

Free Web

Halite Programming Challenge

Halite is an artificial intelligence programming challenge.

Free Open Source Mac OS X Windows Linux

Hackerearth

a social and community platform for students and developers for solving programming puzzles, sharing notes and practicing concepts with the online editor, live...

Free Web