While playing Metal Gear Solid 2 or Metal Gear Solid 3, when you are spotted or go into Alert mode (none that are part of the story line, three for Metal Gear Solid 3 which will be noted at the end of the game), save the game. After saving, do an in-game reset. Load the game. You will resume from the last point you were without any alerts. This is quite useful when attempting to earn the "Complete Stealth" achievement or trophy for Metal Gear Solid 2 and the "Stealth Camouflage" achievement or trophy for Metal Gear Solid 3. You will receive the bonus for "No Alerts" at the end of the game.