Human Resource Machine is one of the most difficult puzzle games we've played in quite some time. It's not difficult for difficulty's sake though, it's difficult because it's different. It requires you to think less like a gamer and more like a developer. One of Human Resource Machine's only major fault is that there are far too few puzzles; its 38 puzzles go very quickly once you have the hang of how to program, leaving a game that could be completed in under an hour depending on your skill level. For those with no programming background, these same puzzles could take hours of your time. It's an excellent game, it'd just be better if there was more of it; that's not a bad problem to have.