Descent

A first-person shooter/shoot ‘em up released in 1995. One of the earliest PC games to feature fully 3D graphics, predating Quake. Descent was unique in that it played deceptively like a space combat sim with similar control layouts, it pioneered 6-degrees-of-freedom gameplay; there is no determined "up" or "down", as your small and maneuverable fighter craft can move left right up or down, turn 360 degrees in all direction and even roll all while doing any of the other things. Taking the role of the Material Defender “Vertigo One”, you explore extraterrestrial mining installations and fight virus infected mining robots, with the goal of destroying the reactor that controls them and rescuing surviving miners along the way. More “Doom but you fly” than Star Wars™ X-Wing, Descent was immediately recognized for its unique gameplay and 3D graphics, and became a critical and commercial success, it is now considered a classic. Descent spawned two sequels and several expansion packs, before becoming a dormant franchise for sixteen years until recently.