Ruby Warrior
This version of Ruby Warrior is a project by Bloc, a part-time online coding bootcamp for people who want to keep their current job, learn how to code, and become a full-time software developer.
Codewars
Achieve code mastery through challenge. Improve your skills by training with others on real code challenges
Kata In our dojo, ...
exercism
Are you a code newbie? Learning to program is exhilarating and challenging... and also frustrating, exhausting, and overwhelmi ...
CodeCombat
CodeCombat is an online game that teaches programming to learners as young as 6. Students write code in real programming langu ...
CodinGame
CodinGame is a challenge-based training platform for programmers where you can play with the hottest programming topics.
Codier
Explore and attempt front-end coding challenges on Codier
Screeps
Screeps is a massive multiplayer online real-time strategy game. Each player can create his or her own colony in a single pers ...
CheckIO
CheckiO is expanding the world’s code literacy through gameplay. We always wanted to create the most entertaining game where g ...