In Half-Life: Opposing Force, players return to the Black Mesa Research Facility to engage in an entirely new episode of single player action and will be offered an enormous variety of new multiplayer content. Gamers play a soldier this time around, instead of Gordon Freeman. Having the option of playing on the opposing force, the player will experiment with a host of new military, experimental and alien weapons. Also a key feature will be to battle a fierce new alien race as well as interaction with more human characters. Finally, in addition to the extensive new single player experience, gamers will compete in new multiplayer maps designed by industry all-stars