Attention gamers of a certain age: you're about to feel very, very old. June 22nd, 2016 marks the 20th anniversary of the original Quake, id Software's classic first-person shooter. It may not be quite as genre-defining as the Doom games that preceded it, but it was still considered revolutionary. For a start, it was presented entirely in 3D (with semi-realistic lighting, no less) at a time when most shooters had to make do with '2.5D' engines -- even the zero-gravity title Descent had some 2D. Quake was also one of the first games of its kind to be built with internet multiplayer in mind, not just local networks. And who can forget the eerie soundtrack from Nine Inch Nails' Trent Reznor?