If you’re hankering to relive some good old fashioned gaming fun on your Mac this week, check out GOG.com. They’re giving away Duke Nukem 3D Atomic Edition for free.

GOG.com – originally Good Old Games – is a gaming service for people with a taste for older computer games. The service provides a large library of classic video games that have been reworked to run on modern computers, and this year they began supporting the Mac too – already they have a ton of games available, with more planned for the future. They’re also selling new games from current Mac game publishers like Virtual Programming. When you sign up, you’ll get access to a bunch of additional free games to help get your GOG game collection off the ground.

Duke Nukem 3D Atomic Edition is the 1996 release from 3D Realms that helped put the gun-wielding flat-top muscleman in the forefront of gamers’ consciousness. Along with Doom and other games of the era, Duke Nukem 3D helped make to define the then-burgeoning first person shooter genre. In it, you play a wisecracking action hero saving the world from vile alien scum. The game’s ribald humor and risqué content (levels featuring strippers and porno shops) earned it no small measure of controversy when it was originally released, though it’s positively tame by today’s standards.

Bear in mind that this isn’t the MacSoft port of the game – like many other GOG offerings, this is the tried-and-true DOS version running inside an emulation layer on your Mac – but it’s the same game you might remember from the mid-90s, for sure, and it still holds up well.