Advent of Code
A daily December programming puzzle with a huge global following — the friendliest way into coding contests.
- Computer Science
- Who can enter
- Anyone worldwide — free; solve in any programming language
- What it costs
- Free — all 25 days of puzzles are open to everyone. Donations are optional and change nothing about the puzzles.
- When it closes
- We could not confirm this year's date against the organiser's own page, so we are not showing a countdown for it. Last published: New puzzles daily 1–25 December; all past years playable any time, free.
Sending this to someone sends the four facts above, not just a name — they will see who can enter and what it costs before they decide.