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tools/CTF.md

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+## CTF
+Welcome to the first part of the comma CTF!
+
+* all the flags are contained in this route: `0c7f0c7f0c7f0c7f|2021-10-13--13-00-00`
+* there's 2 flags in each segment, with roughly increasing difficulty
+* everything you'll need to find the flags is in the openpilot repo
+  * grep is also your friend
+  * first, [setup](https://github.com/commaai/openpilot/tree/master/tools#setup-your-pc) your PC
+  * read the docs & checkout out the tools in tools/ and selfdrive/debug/
+  * tip: once you get the replay and UI up, start by familiarizing yourself with seeking in replay
+
+getting started
+```bash
+# start the route reply
+cd tools/replay
+./replay '0c7f0c7f0c7f0c7f|2021-10-13--13-00-00' --dcam --ecam
+
+# start the UI in another terminal
+selfdrive/ui/ui
+```