Back in Time: Doom

Doom (typeset as DOOM in official documents) is a landmark 1993 first-person shooter video game by id Software.  Being a first-person shooter, Doom is experienced through the eyes of the main character. This character is not named throughout the game. The game's designer, John Romero, has pointed out that this is so the player feels more involved in the game: "There was never a name for the DOOM marine because it's supposed to be YOU."

The player takes the role of a nameless space marine who has been punitively posted to Mars  after assaulting his commanding officer, who ordered his unit to fire upon civilians. The Martian marine base acts as security for the Union Aerospace Corporation (UAC), a multi-planetary conglomerate, which is performing secret experiments with teleportation by creating gateways between the two moons of Mars, Phobos and Deimos. The manual makes it clear that Phobos is considered by space marines to be the dullest assignment imaginable: "with no action for fifty million miles, your day consisted of suckin' dust and watchin' restricted flicks in the rec room." This all changes when the UAC experiments go horribly awry. Computer systems on Phobos malfunction, Deimos disappears entirely, and "something fragging evil" starts pouring out of the gateway, killing or possessing all UAC personnel. Responding to a frantic distress call from the overrun scientists, the Martian marine unit is quickly sent to Phobos to investigate, where the player character is left to guard the hangar with only a pistol while the rest of the group proceeds inside. Over the course of the next few hours, the marine hears assorted garbled radio messages, gunfire, and screams, followed by silence: "Seems your buddies are dead". (by Wiki because lack of time)

And now i have something special :) Play DOOM here and now, bring back memories. (Press Return to show the main menu at the start.)

W and S keys - forwards and backwards movement.

A and D keys - rotate left and right

Q and E keys - strafe left and right

Space Key - Fire

1, 2, 3, 4, 5, 6, 7, 8, and 9 keys - change weapons

Esc key - Show menu (to save and load a games as well as other options)

Return - Select item from menu 

I hope you enjoyed :)