Instinct is something which transcends knowledge. We have, undoubtedly, certain finer fibers that enable us to perceive truths when logical deduction, or any other wilful effort of the brain, is futile.
Madness string 81286
The vast vast majority of defcon ctf is reversing and binary exploitation. Usually with some exotic shit you've never heard or dreamt of. One year they gave everyone some binaries compiled with middle endian, another year they gave everyone some playstations and you had to hack through the game.