ABOUT
A small puzzle for every day.
Number Code is a daily arithmetic puzzle. Everyone gets the same four numbers and the same target, and has three chances to build an expression that reaches it. It takes one to three minutes, and a new code opens every day at 15:00 UTC (midnight in Korea).
Why it exists
It is meant to be a short, calm break that still asks you to think, with no accounts and no streak pressure. Practice mode is unlimited for anyone who wants to keep going, and shared results never spoil the answer.
Who makes it
Number Code is designed, built and run by SangYeon Kim, a frontend developer. Development notes and other projects are on yeony.dev, including a US mortgage rate tracker.
Contact
Found a bug, a puzzle that looks wrong, or have an idea? Email overflowscript@gmail.com.