Write code, challenge friends to predict the output, and climb the leaderboard. The ultimate arena for sharpening your programming intuition.
Study code snippets across 9 languages and predict what the program will print. Sharpen your understanding fast.
Up to 15 players per room. One is the Coder, the rest predict. Roles rotate every round so everyone gets to code.
Answer fast for bonus points. The coder earns rewards when many players guess correctly — write tricky code!
Python, JavaScript, C, C++, Java, C#, Go, PHP, Ruby — choose your weapon and code away.
Read the code, predict the output, and earn points!
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Correct Output:
💡 Explanation:
Set up your arena and invite friends to battle!
Enter the room code shared by your host to jump in!
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Master CodeArena in minutes
A random code snippet is shown to you.
Read the code carefully and type what you think it will print.
Submit your answer to reveal the correct output and explanation.
+10 for correct, +bonus for speed. Keep practicing!
Host creates a room and shares the 6-character code.
One player writes a program. Others wait (and wonder).
Everyone sees the code and has 60s to predict the output.
Correct guessers get +10 pts. Coder gets bonus for tricky code!