Finish Duke Nukem 3D

True 3D, brown corridors, a Nine Inch Nails soundtrack and the birth of deathmatch.

The BFG, the imps and the shareware episode that ran on every office PC in 1993.

The Facility, the watch menu and four-player split-screen; the N64 shooter that changed consoles.

Nine classes, hats and the Heavy; Valve's cartoon shooter, free since 2011.

Handsome Jack, a billion guns and four-player co-op on Pandora.

Instagib, Facing Worlds and the announcer; the arena shooter of 1999.

Master Chief on the ring world, the warthog and the Flood; the Xbox is launched.

The Arbiter, dual wielding and Xbox Live multiplayer; the console shooter online.