I guess I'm not a true gamer. I've played a lot of these games but never heard of any of these myths. From Unreality.com (the copy is theirs).
Growing up, in the days before the internet answered all our questions, video game urban legends flew around from kid to kid like a virus. Before there was any real way to verify whether these things were actually true, we had to take the word of our friend who “swears his cousin could do it.”
GOLDENEYE - SECRET LEVEL IN DAM BASE
It was rumored that there was a secret in the initial level of N64’s Goldeneye. Head to the final dam area, grab a sniper rifle, peer across the lake and there would be a secret base that somehow you could access. The rumors ranged that on that base were secret enemies and hidden weapons, the likes of which you couldn’t find anywhere in the game.
The base was there alright, it was visible as plain as day. But the getting there part? Not going to happen. Turns out the base was a different section of the level at one point, but it was cut from the game and programmers just left the code in a spot that was inaccessible.
But enter Gameshark, which allowed players to travel to the mysterious location where they would find…nothing. No glorious weapons, nor fearsome enemies, just an abandoned base that was much more mysterious from far away.
GRAND THEFT AUTO: SAN ANDREAS - FINDING LEATHERFACE/BIGFOOT
The tale said that if you were in a lumber mill in the middle of the map at exactly midnight, you would hear the revving engine of Leatherface’s chainsaw (or Bigfoot), and if you waited long enough, he would come out of the woods and kill you.
It seemed plausible--the chainsaw was in the game, so why wouldn’t Rockstar put that easter egg in?
I parked my car at 12:00 AM, hopped out and listened. It was raining, and I ran around the camp trying to hear this mystical chainsaw. As I headed back to my car, I heard it--the humming engine of what had to be Leatherface coming to kill me. A minute passed. Then five, then ten. Nothing happened. The sound I had heard was my own car's engine.
Leatherface (and Bigfoot) weren’t in the game, and only appeared through PC mods later on, as seen above.
(List continues at Unreality.com)