Cheat: Defeat The End Easily
Not many 60-90 minute boss fights are worth the time, but the duel against The End is a classic. If you are pressed for time, you can skip the fight altogether. First, enter The End's boss fight area. Save the game and go to the PlayStation 2's hardware settings. Advance the clock a few years, then launch Metal Gear Solid 3 using your save. Now you won't have to fight The End since he died of old age.
Here's another way to defeat The End. After the first swamp area with the one-man hovercrafts, a cutscene will play. After the cutscene, take out your sniper rifle and kill The End as he's being rolled away in his wheelchair.