Today, however, the game is a full 20 years old, and id Software is throwing the classic FPS a celebration. (Joystiq)To celebrate the 20th anniversary of Wolfenstein 3D, the game is returning, in brower form.You can play the classic PC game directly in browser at Bethesdas site, or on the Wolfenstein Facebook page. (G4 TV)Gaming today is a multi-billion dollar industry, growing each year. (Softped