Wolfenstein 3D-Online game

Wolfenstein 3D (originally Wolfenstein 3-D, commonly abbreviated to Wolf 3D) is a video game that is generally regarded as having popularized the first person shooter genre on the PC. It was created by id Software and published by Apogee Software. Released on May 5, 1992 for DOS, the game was inspired by the 1980s Muse Software computer games Castle Wolfenstein and Beyond Castle Wolfenstein. It has been ported to a wide variety of systems, including 3DO, Super NES, Game Boy Advance, Acorn Archimedes, Atari Jaguar, and the Apple IIGS.
Each episode features ten levels (or "missions") which have to be finished sequentially. Only nine levels need to be completed; hidden in one of the first eight missions was an entrance to the tenth, secret level. The secret level of the third episode was notable in that it recreated one of the original Pac-Man levels, complete with ghosts, seen by the player from Pac-Man's perspective. Wolfenstein 3D was the first game to use the ExMx map/level naming convention.
Each episode has a different boss who has to be killed in the final mission in order to complete the episode. Unlike normal enemies, boss enemies are drawn from one angle instead of eight, so the player can't sneak up on them or take them by surprise. Bosses also won't notice the player or become active until they see the player. When most bosses are killed, a replay (called a "deathcam") of the boss's death is shown; the episode then ends. In the version released for the Macintosh, all the bosses, except the final boss, Adolf Hitler, drop a gold key which opens a door to the end of the level. Hitler was proclaimed the 15th greatest video game boss in history by The Phoenix.
Despite the presence of Hitler as an episode boss, the game bears no resemblance to any actual Nazi plans or structures. Indeed, many of the level designs are highly fanciful; at least three levels heavily feature swastika-shaped room layouts and maps, going as far as having one level built entirely of a tessellation of them.
The early concept of the game included some innovative stealth concepts - dragging dead bodies, swapping uniforms with fallen guards, silent attacks, etc., like in the old 2D Wolfenstein games, which focused more on stealth than action. These ideas were dropped however, since they drastically slowed the game down and made the controls complicated