#20 – Doom – 1993
This game definitely doesn’t deserve #20, and the reason we say that is because this game was the most influential game for the further development of first-person shooter games.
This game was developed by iD Software and published by GT Interactive. Doom was divided into three episodes of nine levels of game-play and it was distributed via mail order and shareware. In this game, the player controls a space marine named Doomguy and fights off demons from Hell.