For the time, Duke Nukem 3D was next to cutting-edge, building on the technology of earlier games like “Doom” and “Marathon”. Duke Nukem 3D does have several innovations above its predecessors that make it unique. It sports a series of maintenance tunnels and vents that allow players to find secret equipment stashes and to circumvent enemies. It allows players to store health powerups, to be used as needed. The engine also sports an array of aesthetic upgrades such as horizontally-opening doors (notice how all the doors in Doom only move up and down?)
For all its improvements, Duke Nukem 3D came under fire most for its graphic content. The game features abundant sexual imagery as well as bound and nearly-naked women, displayed for the perverse pleasure of the alien invaders. Many reviewers took these images for senseless pandering and hammered the game with negative reviews. While the game does not handle this sort of material in the most mature fashion possible, it does at least punish players for mistreating the women, usually with a huge infusion of enemy troops that would not have appeared otherwise.