You know the drill mate, scroll down till you find sumthin to your interest(s). NOTE: not every single one of these codes works, notify me of the ones that dont work aight? :)

• EEAD-6F63
  Increased damage, but doesn't show up on status screen

• 3AAD-6F63
  Every attack does one damage

• 6666-0DDA
  More enemies fit on the battle screen

• 3AAD-64D3
  Every hit (even monsters) does 9999 damage
  

• 82A3-6F63
  Infinite hit points
  

• FDA3-6F63
  Attack and all enemies die
  

• D3A8-6F63
  Go into battle, and all enemies die
  

• 86A3-6F63
  Max hp, can't take damage
  

• B6C2-AF6F
  Get an item, from battle, chest, receive 2,913 of that item

• 0DE7-6D04
  Walk and music from beginning of game plays
  

• 3336-0D6E
  Max gp after one battle
  

• 8267-0D62
  Magic power doesn't go down
  

• C3AD-AFA9
  Money doesn't decrease in shops
  

• DF30-076E
  1000's of exp and gp after battle
  

• 0CCA-AF6F
  Walk through walls(very useful)
  

• 30E5-DDDD, 31EE-646D
  Go into a town and talk to a person. You will get into a battle, and your sole party member will be Golbez Level 50, HP 2943/2943, MP 180/180. His battle menu is just "Fight", but you can change it using other codes (try giving him Twin!)
  

• A1E5-DDDD
  Talk to someone and get the big whale ship
  

• 0CC3-0F64
  Walk through walls (this one works)
  

• E3A5-64D0
  All characters can equip anything, Weapons, Armour, Shields, you name it!
  

• 00CE-6D69
  Gunslinger code for the FFIV Easytype (FF2)
  

• 00CF-A469
  Gunslinger code for the FFIV Hardtype (FF4)

Gunslinger Code Explination;

When this code is in use, put a worthless item (rubyring, e.g.) into the very first slot in the item list. Have some potions (cures) in the slot to the right. Select a potion and use it on the middle character in a five-person team. You'll notice after using it, the item in the first position became something else. Repeat using the potions until you get a good item. This is the best way to get five adamant armors for your team if you don't mind using game genie. Some emulators make use of game genie codes.

• 6667-6DA2
  It makes Kain invinsible when he jumps to strike an enemy - makes him a secret character. But remember to turn on effects or if an enemy uses a spell the game will freeze.

• EE67-OD02
  Anything that casts a spell dies.

• 6667-ODO2
  Changes Cecil and Rosa into Dark Knights; When they use a white magic spell they start flashing but turn off effects or game will freeze: Warning! Retreat and you will see two dark knights on the moon.

• E567-ODO2
  A person in your party or an enemy dies when they use any form of magic. Also when Cecil uses magic to cure he disappears and becomes a dark knight on the screen.

• AA67-ODO2
  Cecil turns into a Dark Knight; This code was very weird! Cecil uses magic and turns himself into a dark knight. Then he can do dummy and floats in the air.

• CC67-ODO2
  Cecil turns into Edward after using magic!

• 9967-ODO2
  Make characters invisible; It makes Cecil, Rosa, Rydia, and Edge invinsible when walking and is just a tiny little dot on a battle, they can't do anything.

More to come, stay tuned :)