Challenge yourself on small coding exercises called "kata". Each kata is crafted by the community to help you strengthen different coding techniques. Master your current language of choice, or …

Longest Substring Without Repeating Characters. 4. Median of Two Sorted Arrays. 5. Longest Palindromic Substring. 6. Zigzag Conversion. 7. Reverse Integer. 8. String to Integer (atoi) 9. …

Practice over 5000+ problems and challenges in coding languages like Python, Java, JavaScript, C++, SQL and HTML. Start with beginner friendly challenges and solve hard problems as you …

Apr 28, 2025 · These fun practice coding challenges will help you learn the basics of programming and improve your problem-solving skills, giving you confidence as you learn to …

Over 1000+ challenges to choose from! From basic loops to advanced algorithmic puzzles, our coding challenges will give your coding practice an upgrade! Sharpen your logic. Enhance …

Practice coding with fun, bite-sized challenges. Earn XP, unlock achievements and level up. It's like Duolingo for learning to code.

CodinGame is a challenge-based training platform for programmers where you can play with the hottest programming topics. Solve games, code AI bots, learn from your peers, have fun.

Sharpen your coding skills with 2000+ coding challenges ranging from very easy to expert levels. Compete with fellow challengers, earn XPs, and stay on the leaderboard.

Test your knowledge with code challenges based on real-world technical interviews. Practice for your job search — or for fun.

Helping you become a better software engineer through coding challenges that build real applications. The coding challenges are all designed to walk you through the process of …