Yesterday, Wolfenstein 3D was a measly 19 years and 364 days old. Puh-shaw, we say. Today, however, the game is a full 20 years old, and id Software is throwing the classic FPS a celebration. Rather than sending all the game's fans party hats and individual slices of cake, though, id's ported Wolf 3D to web browsers, making it totally free!

But perhaps you're not around a computer at the moment, and you'd prefer to play on the go? id's got that covered too, making the iOS port of Wolfenstein 3D free for today only (the iTunes page still reflects a $1.99 price as of this writing, but Bethesda says it'll flip to free "later today").

Or maybe you've already played Wolf 3D more than you'll ever need to? Creator John Carmack recorded a director commentary aimed at superfans of the series, which we've embedded just below the break. Let us know if he talks about rockets at all!