Challenges
Ready to level up? Dive into our coding challenges to have fun and acquire new skills.
NEW! Grow your skills
Challenges offer an easy way to test your understanding and pick up some additional skills along the way.
Add your entry to the challenge
Put your coding skills to the test and share your answer with everyone. We're excited to see what you've come up with.
Time to discuss and vote
Explore the diverse solutions from our community. Share your thoughts through comments, ask questions, and appreciate great code by casting your vote for the best entry.
And the awards go to...
Your brilliant solutions earn you special recognition! We'll be highlighting top contributors and insightful approaches, so put your best code forward.
Challenge #13: Integer sorting in a grid
Image designed by macrovector / Freepik Credit to @JMP for contributing this challenge idea! (Which we slightly modified.) In this challenge, we will sort some numbers onto a 6x6 square grid. Each ...
Challenge #12: Spooky Halloween scene [Voting period]
Update, Nov 7: The challenge is now in the voting period. Please vote for your favorite entries. Voting continues till Nov 13. We are approaching Halloween which is celebrated on October 31 in many ...
- 33.5k
Challenge #11: Taco crawl optimization [COMPLETED]
Update on October 23: Huge thanks to everyone who participated in the challenge. The correct routing was [0,7,5,6,2,10,4] for 97 tastiness and 2.8945 tastiness/distance. 43 of the 53 entries provided ...
Challenge #10: Road safety challenge (joint with Kaggle) [COMPLETED]
Update, Nov 1, 2025: The challenge is now complete. Thanks to those that participated. We'll review the entries and soon announce the users that receive the badge. Kaggle is a platform for Machine ...
Challenge #9: Random Number Generator [COMPLETED]
Update: October 6, 2025: Thanks to everyone who participated in this challenge! It was very interesting to see the diverse approaches to random number generation. Congratulations to the following ...
Challenge #8: Word ladder [COMPLETED]
Update, October 2, 2025: Appreciation to everyone who participated in this challenge! The correct length of the word ladders is as follows: [stone, money] [11] [bread, crumb] [11] [smile, giant] [11] ...
- 33.5k
Challenge #7: Pangram checker [COMPLETED]
Update, October 2, 2025: A HUGE thanks to everyone who participated in this challenge! The correct answer is: 819 Non-Pangrams, 132 Pangrams (non-perfect) and 49 Perfect-Pangrams. We are very ...
- 33.5k
Challenge #6: Integer Counting [COMPLETED]
Update on October 8, 2025: Thanks to everyone who voted on the entries! We received 281 votes from 59 users. There were a lot of great responses to this challenge. We appreciate the participation. We'...
Challenge #5: Traffic Light Simulator [COMPLETED]
Congratulations to Kamran for the best response to this challenge! We were impressed by your simulation and also the inclusion of variable weather elements. This Challenge is now closed but entries ...
- 33.5k
Challenges Sandbox – Help us create new challenges
We are making some upgrades to Challenges – one of which is allowing users to contribute their own! If you have an idea for a challenge, please post it as an entry here in this Sandbox, where it can ...
Challenge #4: Create a futuristic technology [COMPLETED]
Awards for the fourth Stack Overflow code challenge: Most Upvotes: Davide Fiocco Vision Architect: 12Kittens New Contributor: Prakhar Agarwal All of the awards given (aside from most upvotes) are ...
Challenge #3: Creating ASCII art snowflakes [COMPLETED]
Awards for the third Stack Overflow code challenge: Most Upvotes: André Serene Scene Creator: Ale_Bianco New Contributor: Michael Brown Most Customizable: FoxWise Snowflake Artisan: Newpzo All of the ...
- 33.5k
Challenge #2: Secret messages in game boards [COMPLETED]
Awards for the second Stack Overflow code challenge: Most upvotes: Ale_Bianco Puzzle prodigy: Anon Coward New contributor: Ayan Nayak Most imaginative: Bladeski Straight to the point: NullDev All of ...
- 33.5k
Challenge #1: Implement a text-to-baby-talk translator [COMPLETED]
Awards for the first Stack Overflow code challenge: Most upvotes: Anon Coward Bells and whistles: Ali Sheikhpour New contributor: Kingsley_3z3nw4k4 Most sophisticated: return true Technically correct: ...