First level playthrough

First level does a good job of showing how Duke depends on 3d platforming to find secrets. The first level shows off a lot of good features of the game. Jumping, free aiming (unlike doom), true 3d, etc. There's even a security camera you can use to see other parts of the level. The movie posters and Duke's voice give a good sample of what else you can expect from this game later on. It also shows how you find secrets and rescue babes that the aliens have kidnapped.