Twenty years after revolutionizing gaming, the iconic Wolfenstein 3D is back. And it won’t cost you a dime to enjoy it.

To celebrate the 20th anniversary of the first first-person shooter, id Software and its parent company Bethesda Softworks have released a free-to-play web version of the game that runs right out of your web browser. For folks who prefer their gaming on the go, the developer will also offer Wolfenstein 3D Classic Platinum free to iPhone, iPad, and iPod Touch owners for a limited time.

Read more at Yahoo! Games