Duke Nukem is a can-do hero who realizes that sometimes innocent people have to die in order to save Earth, so accuracy of gun fire is not a real concern to him. This is the award winning game that helped define the FPS genre and introduced unparalleled interactivity and a talking main character.

Take the fight to the aliens in Hollywood, Los Angeles, a moon base and alien spacecraft. Defeat the aliens, so Duke can get back to some R&R with a stogie, a warm belly and a bottle of Jack.

Atomic Edition is the most complete version of the game that includes fourth bonus episode, new weapon and enemies.

Duke Nukem 3D is entirely free, for Mac and PC.

The GOG.com DRM-Free Holiday Sale kicked off with the Bullfrog Pack (Dungeon Keeper 1+2, Populous 1-3, Syndicate, Theme Hospital and Magic Carpet) for just $11.92 (75% off). Or Master of Orion 1+2 for $2.99. Or... well, just go to the site to see today's deals.