Remember back when first-person shooter games were in their infancy, born from your floppy disk copy of Wolfenstein 3D?

It’s been a long time since those days—20 years now, in fact—and Bethesda Softworks is celebrating the anniversary of the game with a little treat for fans of the classic: the ability to play it for free whenever you want.

Continue reading to find out where you can play Wolfenstein 3D and to see a video of id Software technical director John Carmack playing the game while talking about its creation and development.

To play the new browser-based Wolfenstein 3D, all you need do is head to its website or its Facebook page and get to killin’ them Nazis.

You can also grab the Wolfenstein 3D Classic Platinum edition of the game for your iPad, iPhone, or iPod Touch at the Apple app store, also free for a limited time.

Video

[Source: Bethesda]