I think they can be useful for repetition, but creating full projects on your own are probably more useful. I've used https://codewars.com and like the way it works, but the difficulty ramp isn't great (or it wasn't). Answer from rjcarr on reddit.com
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Substack
codingchallenges.substack.com
Coding Challenges | John Crickett | Substack
โ€œGreat newsletter for engineers that would like to learn a new language or sharpen existing skills by working on real-world applications. Weekly coding challenges that are aimed at helping software engineers level up by practicing building real-world applications.
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Codecademy
codecademy.com โ€บ code-challenges
Code challenges | Codecademy
Test your knowledge with code challenges based on real-world technical interviews from companies like Google, Amazon, and Meta. Practice for your job search โ€” or for fun. Donโ€™t worry if you get stuck.
Discussions

Recommended coding challenge websites?
I think they can be useful for repetition, but creating full projects on your own are probably more useful. I've used https://codewars.com and like the way it works, but the difficulty ramp isn't great (or it wasn't). More on reddit.com
๐ŸŒ r/learnprogramming
20
70
May 28, 2021
Weekly Subreddit Coding Challenges

Fantastic idea!

More on reddit.com
๐ŸŒ r/learnjavascript
15
74
September 13, 2018
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LeetCode
leetcode.com
LeetCode - The World's Leading Online Programming Learning Platform
Level up your coding skills and quickly land a job. This is the best place to expand your knowledge and get prepared for your next interview.
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Programiz PRO
programiz.pro โ€บ community-challenges
Coding Challenges | Programiz PRO
Sharpen your coding skills with 2000+ coding challenges ranging from very easy to expert levels.
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Coding Challenges
codingchallenges.fyi
Hello from Coding Challenges | Coding Challenges
The coding challenges are all designed to walk you through the process of creating an application and to be less than 8 hours work.
Find elsewhere
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Edabit
edabit.com โ€บ challenges
10000+ Coding Practice Challenges // Edabit
We cannot provide a description for this page right now
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CodinGame
codingame.com โ€บ start
Coding Games and Programming Challenges to Code Better
Level up your coding with games, puzzles, and challenges. ... Discover why 3 million+ developers love CodinGame. 100% free. ... Show off your JavaScript skills in a Clash of Codes or brush up your Python while building a bot.
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CodeChef
codechef.com โ€บ practice
Online Coding Practice Problems & Challenges - CodeChef
Practice over 5000+ problems in coding languages like Python, Java, JavaScript, C++, SQL and HTML. Start with beginner friendly challenges and solve hard problems as you become better. Use these practice problems and challenges to prove your coding skills.
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Reply Challenges
challenges.reply.com โ€บ challenges โ€บ coding โ€บ home
Code Challenge Standard | Reply Challenges
The Code Challenge is an international team-based coding competition, powered by Reply since 2019, consisting of an algorithm-based problem to solve in 4 hours, starting from an input file format and few scoring rules.
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Medium
zulie.medium.com โ€บ 16-great-coding-challenges-you-can-try-out-5ced49e1fe44
16 Great Coding Challenges You Can Try Out | by Zulie Rane | Medium
July 1, 2021 - Java Coding Monk offers a list of articles that walk through various problems and their solutions in an article format. To challenge yourself, why not try to see how many you can solve within an hour? The cool thing about Java Code Monkโ€™s Java coding challenges is that they often offer multiple approaches.
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Felipe Vogel
fpsvogel.com โ€บ posts โ€บ 2025 โ€บ types-of-coding-challenges
A catalog of coding challenges | Felipe Vogel
September 30, 2025 - An exploration of the many kinds of coding challenges, from LeetCode to code golf, and suggestions of more valuable ways to improve yourself as a developer.
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Vercel
jscodechallenges.vercel.app
JavaScript Code Challenges
Collection of modern interview code challenges on JavaScript suitable for Interviewees | Interviewers | Knowledge test | Practice
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CodeCrafters
codecrafters.io
CodeCrafters | The Hardest Programming Challenges on the Internet
Advanced programming challenges for experienced engineers. Rebuild real production tools like Redis, Git, and SQLite from scratch in your IDE. Used by engineers at Google, OpenAI, and Vercel.
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Edabit
edabit.com
Edabit // Learn to Code with 10,000+ Interactive Challenges
We cannot provide a description for this page right now
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W3Schools
w3schools.com โ€บ python โ€บ python_challenges.asp
Python Code Challenges
Loading challenges... Code challenges are interactive coding exercises where you write Python code to achieve a specific result.
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devChallenges
devchallenges.io
devChallenges | Real-life Projects To Practice Your Skills And Land A Job
To improve your code and extend your knowledge, review othersโ€˜ code and give them feedback to improve. These skills are essential in the workplace.Start coding now ... This roadmap is designed for you to practice HTML, CSS, and basic JavaScript. You can practice with frameworks like Tailwind CSS, Bootstrap,... based on your need. ... This challenge is a great way to start with basic HTML and CSS skills.