$ ctf42

🇺🇸 SillyCTF

by Penn State CCSO 🇺🇸 United States CTFtime flag format sillyCTF{...}

Registration now open! Register at sillyctf.psuccso.org.

Join Discord for updates: https://discord.gg/sEcYRUTAvj

The least serious CTF. Hosted by the Competitive Cyber Security Organization at Penn State.

SillyCTF 2025 will include cybersecurity challenges across several different categories, with many unconventional problems to solve.

Note that prizes will only be awarded to teams composed entirely of currently-enrolled undergraduate or graduate students with .edu email addresses.

Archived challenges by category

Editions

EditionWeight ReverseCryptoForensicsMiscOSINT Total
2025 25.00 255146 32