Challenges
Ready to level up? Dive into our coding challenges to have fun and acquire new skills.
Code Challenge #9: Random Number Generator
Today's challenge is about random numbers. Programming languages usually contain functions to generate random numbers, but in this challenge, we will create our own. And then, we'll measure how random ...
Code Challenge #6: Integer Counting
Update on September 30, 2025: We've now entered the voting period which lasts till October 6th. All of the responses are visible. Please upvote your favorite entries. Our previous challenges had more ...
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-COMPLETE- Code Challenge #8: Word ladder
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] ...
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-COMPLETE- Code Challenge #7: Pangram checker
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 ...
-COMPLETE- Code Challenge #1: Implement a text-to-baby-talk translator
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: ...
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Road safety challenge (joint with Kaggle)
Kaggle is a platform for Machine Learning and Data Science folks to explore data and complete challenges. We’ve teamed up with them to create a special two-part challenge! Kaggle’s October Playground ...
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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 ...
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-COMPLETE- Code Challenge #5: Traffic Light Simulator
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 ...
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-COMPLETE- Code Challenge #4: Create a futuristic technology
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 ...
-COMPLETE- Code Challenge #3: Creating ASCII art snowflakes
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 ...
-COMPLETE- Code Challenge #2: Secret messages in game boards
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 ...