By checking out this link, you'll be able to play all of Wolfenstein 3D in your browser window. You can also watch a Director's Commentary for the game on YouTube with id Software co-founder and Wolfenstein 3D developer John Carmack here.
For those unfamiliar with the game, Wolfenstein 3D is one of the earliest first-person shooters, based on the game Castle Wolfenstein from 1981 for the Apple II. The premise of the game is simple: take your gun and kill Nazis in order to escape Castle Wolfenstein during WWII. According to TIME, Wolfenstein 3D was a pioneer in 3D effects, showing enemies from eight different angles instead of just a head-on view, which was the norm for prior computer games.
The game was originally published by Apogee Software as free shareware and was a precursor to the iconic 1993 release Doom FPS, alsoRead More »from ‘Wolfenstein 3D’ available to play for free in browser for game’s anniversary