The challenges
6 challenges, 120 points. Read the briefing here, then play it in your own terminal. Nothing on this page is a flag, and nothing is a solution.
These pages are the briefing, not the game
The challenge files only exist on your device, so the work happens in Termux. Install
the tool, then run the command on each page to set that challenge up.
Easy · 2 challenges
| # | Challenge | Topic | Points |
|---|---|---|---|
| 01 | Hidden in plain sight Find the file in your home directory that holds the flag, and read it. | Filesystem | 10 |
| 02 | Owner only Read the file that only your account is allowed to open. | Permissions | 15 |
Medium · 3 challenges
| # | Challenge | Topic | Points |
|---|---|---|---|
| 03 | Two halves Join the two halves of the flag, which sit in different directories. | Filesystem | 20 |
| 04 | Read the log Find the flag in a web server log, without reading every line. | Text | 20 |
| 06 | Inside the archive Read a file out of a compressed backup without unpacking it. | Archives | 25 |
Hard · 1 challenge
| # | Challenge | Topic | Points |
|---|---|---|---|
| 05 | Twice over Undo two layers of encoding to get the flag back. | Encoding | 30 |
Playing them in order
They are numbered easiest first, and each one teaches something the next one leans on. You can jump straight to the hard ones if you would rather, but the two Easy challenges are worth ten minutes even if you think you know them.
Every challenge, listed
Hidden in plain sight · Owner only · Two halves · Read the log · Twice over · Inside the archive