First enable the MASTER cheat by entering FMNBF on the cheat menu. Next, turn on INVISIBILITY cheat. Start a new game. When you come out of the water at the bottom of the mountains where you need to climb to the top to complete the objective, shoot the enemy to the LEFT in the HEAD TWICE to make his HEAD EXPLODE. Then shoot the enemy on the RIGHT ONCE in the CHEST. While the enemy is running into the wall where you must climb the vines,kill ALL the LEMURS you see on screen at that time. Then shoot the enemy that is running into the vines in the HEAD, ONCE. When his HEAD explodes, the vines he was running into turns red until his body disappears.
If you are having trouble with the game and you want all the weapons,Unlimited health,Invisable,and just for fun a huge heade then this cheat is right for you. The best cheat is: FMNFB Hope iv'e helped