Community
Train with other operators on Discord
Signal9's community lives on Discord: ask for a hint when a lab has you stuck, talk through the daily puzzle and study for your cert with people doing the same.
What's on the server
No full walkthroughs outside #writeups, and hints come as questions, so nobody gets a lab spoiled for them.
Start here
- welcome-and-rulesHouse rules, the spoiler policy and how to get your first solve.
- announcementsNew tracks, CTF seasons and anything that changes how you train.
- platform-changelogWhat shipped on signal9.sh, as it ships.
The floor
- introductionsSay who you are and what you're training for.
- generalEverything else Linux and security.
Daily reps
- daily-challengeTalk through the day's One-Liner Dojo puzzle.
Help desk
- help-me-debugStuck in a lab? Post what you tried; hints come as questions.
- grading-questionsThink the grader got it wrong? Tell us here.
Cert prep
- rhcsa-prepStudy together for the RHCSA.
On Signal9 itself
- Write-ups. Once you clear a lab, read how other learners solved it and publish your own from the lab page. Browse labs
- Leaderboard. Weekly XP, all-time totals and One-Liner Dojo stars. See the board