- https://9447.plumbing
- Scoreboard or local alternative
- Sources for all challenges
- Participants: 1136
- exploitation/calcpop
- exploitation/cards
- misc/get-help
- misc/give-feedback
- misc/recon-1
- misc/recon-2
- reversing/flag-finder
- reversing/the-real-flag-finder
- steganography/binned
- steganography/gife-up-now
- steganography/imaged
- web/premonition
- web/super-turbo-atomic-gif-converter
- web/yws
- crypto/dub-key
- crypto/fibbed
- crypto/randbox
- crypto/wob-key
- crypto/wob-key-hard
- exploitation/bws
- exploitation/calpop-reloaded
- exploitation/redos
- exploitation/search-engine
- exploitation/wtfos
- misc/4w1h
- misc/ctfclicker
- reversing/0ldskoo1
- reversing/danklang
- reversing/hello-joe
- reversing/nobranch
- web/nicklesndimes
- web/sanutf8y-check