Though gaming has been around since the 1970s, it's the 1980s and early 1990s that are often credited with bringing about some of the most influential video games of all time. These games are usually credited with creating mechanics that have since become staples of the industry, creating now-iconic characters, and even forging entire genres. The original Doom is certainly one such game, widely considered to be one of the most influential shooters of all time.