Resident Evil 3: Nemesis

When on the bridge between the park and the lab, choose to jump off the bridge instead of pushing Nemesis off, it changes the end of the game along with other scenes through the rest of the game.

To read the director's message. beat the game 8 times. Note: this is the only chance you get to read it.

When you beat the game for the first 8 times, you would be awarded 8 different Epilogue Files of 8 different Resident Evil Characters, telling you what has happened to each of them after their adventures. Here's the order that you can unlock them in:

To unlock the mercenary game, beat the game once on any difficulty.

Every time you play, you will get a ranking and money, the better your performance the better your reward. Completing the mission greatly increases your reward. When you recieve enough money you can purchase a weapons with infinite ammo for the regular game.*

You can purchase the :

Assault Rifle w/ infinite ammo. $2000

Gatling Gun w/infinite ammo. $3000

Rocket Launcher w/ infinite ammo. $4000

Infinite ammo for all weapons. $9999

Each time you defeat Nemesis in Hard Mode he will drop something.

Near the end of the game where you fight the mutated version of Nemesis, look at the huge body near one of the batteries. This is the Mr. X tyrant from Resident Evil 2.