picoCTF (Carnegie Mellon)
Learn hacking by doing it — Carnegie Mellon's free capture-the-flag, from first puzzle to hard.
- Computer Science
- Who can enter
- Middle- and high-school students worldwide — free; all levels
- What it costs
- Free — Carnegie Mellon runs it at no cost, including the practice gym that stays open all year.
- 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: Annual two-week CTF in spring; the practice gym is open all year.
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.