Guessed by Darashiva
This is one of those games that work solely through their concept. Portal was crazy innovative, and blowing our minds was pretty much all it had to do, hence why about half of the game is basically a tutorial - because it really doesn't feel like one the first time. Nowadays, it's kinda hard to get the same enjoyment out of this one, because when you know exactly how everything works, there's only a handful of challenging levels and most of the game just feels like... elementary school, really. The experience as a whole is quite impactful, what with all the memorable GLaDOS dialogue going on, and the rather awesome ending, but in a world where Portal 2 is a thing, this one is more of a novelty.