Most of the puzzle questions are straight out of a CS education. Actually it mostly concentrates on about 3 classes worth of CS, your algorithms course, your o

Most of the puzzle questions are straight out of a CS education. Actually it mostly concentrates on about 3 classes worth of CS, your algorithms course, your operating systems/multi-threading course, your networking class and maybe your discrete math course. Of those the most important is your algorithms course. Those happen be the harder classes too and are the core of a CS education. Unless it reveals a deficiency that you had in your CS education or some skill set they are hiring for (and even then), it's okay to say: I've never encountered that before and then try to work through it.