In fact you sometimes get the impression that GT are mocking the folks at Core such are the similarities, even down to the bit where Duke finds a Lara outfit hanging in a wardrobe and comes out with one of his choice phrases. His auto-aiming isn't as precise as Laras which makes for a little more in the skill department although there is a nice feature whereby pressing one of the shoulder buttons zooms the camera into almost first person mode with a red dot for those hard to target shots. The game starts in L.A. where Duke has to find three crystals to operate the time machine so he can go back and forth through the centuries and exterminate these dastardly aliens. Levels include Wild West, Futuristic L.A. and Roman scenarios and Duke comes dressed accordingly. Imagine that, Duke Nukem in a fetching Toga.
Weapons also change according to the time zone.
It's the same basic concept as Duke 3D, basically find keys to open doors and kill everything that moves. Duke still retains his inimitable sense of humour from the previous game and the fact that you can shoot and blow up almost anything makes for good entertainment. The main enemies are the usual suspects. Lizards and Pig Cops sporting appropriate attire too. If you get bored of trailing round the huge levels you could always take a breather and call in a mate to challenge with the Deathmatch option.