Game (not) Over

Your room is lit by a single monitor, it's blue light seeping into the shadows, the still quiet broken by soft humming of a pc whirring away in the corner, and the occasional click, tap, click of a keyboard and mouse. It's late, but you decide to load up your favourite game, Portal 2, despite having played it many, many times before. You've always loved this game.. but this time, something feels off.