10. Deus Ex
Deus Ex broke genre boundaries by combining role-playing elements with that of a first-person shooter, and in doing so delivered one of the best stories ever told on the PC. Thanks to much of the game's emergence, players were able to tell their own story through the actions they took within the game. How they played the game—whether they did so through violence or subterfuge—defined the entirety of the Deus Ex experience.
