Nice. I recall there were .txt files in the filesystem where you could leave your name and a shoutout after completing a level. Mostly „Kilroy was here“ equivalents. But it felt oh so 1337 hacker to add yourself. Quite the motivation boost for a teenager. :-)

Also see https://microcorruption.com. You don’t need Linux-specific knowledge. It directly goes to MSP430 assembly. A nice and compact introduction to exploiting binaries and embedded systems.