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Basically, this is a game set up for people to try to hack into. This
person succeeded by exploiting its misuse of printf()[1] to get hold
of luaL_openlibs() and from there os.execute(). Pretty neat read.

[1] If I'm reading correctly, the bug is in the game's own print()
implementation, and not Lua's standard print(). :-)

Sent from my Game Boy.