The game recreates each of the sections of the film, starting with a side-scrolling journey through the jungle, with paths to cross both horizontally and vertically, and the ability to jump or duck hazards. You will need to blow up a bridge and then locate a village, which contains a torch, a map and a trap-door. The enemy has booby-trapped the area and are launching airstrikes, so the danger is not all from enemy ground soldiers.
The next section is in first-person 3D, as you move through a network of tunnels in search of flares and a compass. There are 3 distinct control methods, changing from the standard motion when an enemy appears (this puts you in control of a cross-hair for more accurate targeting), and when you enter a room to search.
After escaping this you settle in a bunker overnight, and have a limited amount of flares with which to locate incoming enemy, and must then shoot them before they can shoot you. The jungle airstrike from the film is the next moment - you have two minutes to rush into a safe position to the north, using your compass for guidance.
Finally you face the treacherous Sergeant Barnes, and must hit him with grenades 5 times whilst trapped in a foxhole to prevent him wiping you out.