Frozen Bubble - Frozen bubble
Codewars - Achieve code mastery through challenge.
WikiQuiz - Generate quizzes from Wikipedia articles.
CodinGame - CodinGame provides users with a fun and effective way to learn coding that eschews the rigid structure of traditional teaching methods.
Angry Birds POP - Angry Birds meets bubble shooter, use your slingshot to match and burst colorful bubbles.
Codility - The programmer testing solution that matches your job descriptions and helps you hire great...