Blood Omen 2 [GC]
Press Z, R, L, B, X, Y at the main menu. A voice will say "Go cheese" to confirm correct code entry. Start a new game to begin with the Soul Reaver and Iron Armor.
Instant death attack:
To do an instant death attack, you must have mist in the area of the person. Enter the mist using your dark skill ability "Mist", then sneak up behind them. A skull will appear. Use this time to attack and you will cause instant death to the enemy. Note: If you run into the front of the person, they will immediately attack.
Immediately after clearing a checkpoint, if you are low on health, reload the game. You will be back exactly where you just were, except your health meter is now completely full.
Raising Kain's lore:
When you encounter a save point, avoid it. Instead, first kill all the enemies ahead. After your satisfied with the amount of enemies you have killed, backtrack to the save point that was skipped and hit it. The game records your current lore level at this point. Next, after the save point is hit, kill yourself. Therefore when you regenerate at the save point, you will have the same amount of lore. All the enemies that you already killed are back. Kill them again and get even more lore. The Relic Boxes also work in the same way.
Note: Do not max out Kain's lore (blood bar roughly the same length as lore bar and lore bar full). If this is done and the game is saved, Kain's blood bar will revert to absolutely nothing. If this happens, a simple jump will cause Kain to die. If you kill all available targets (including humans) throughout the game, you will achieve the same blood bar level as you would using the trick. If you do use this trick and are nearly maxed out, stop drinking blood and opening relics. Otherwise, you will lose all your hard work when you save.