Cheat Final Fantasy 9 PSX

Unlock blackjack mini-game
When you finish the game, wait for the credits to scroll to the end (do not try and skip the credits). When "The End" appears, press the following sequence of buttons:
R2, L1, R2, R2, up, X, right, circle, down, triangle, L2, R1, R2, L1, square (x2).
If this is done correctly, you should hear a sound. Press start to play the game.
Alternate endings
To unlock and view alternate endings, complete the game with either a "Zeus Hammer" or "Save The Queen" in your inventory.
Infinite MP
Have Amarant in your party and make sure he has learned the Chakra skill. Also, the minimum MP needed for this trick to work is 4 MP. Enter a battle and have Amarant cast Chakra on himself. For 4 MP, he will restore MP equivalent to about 20% of his maximum MP. Continually cast it until you have reached your maximum MP. Use this trick on all your other characters.
submitted by Ahi T.
Easy AP
Walk around in the darkness for a while in the field and forests around the town that has the auction house and lady who collects the zodiac signs. You will encounter a ghost. Give it some ore and you will win the battle, resulting in 10 AP.
submitted by koji
Jump rope mini-game
Have Vivi approach the girls jumping rope near the ticket both in Alexandria. Talk to them and they will let Vivi join them. Press X when the symbol appears over Vivi's head to jump. Keep jumping successfully to get Gil, rare cards, and other items.
submitted by Ahi T.
Simple way to quadruple Vivi's magic attacks
Tired of Vivi not living up to his powers? Just equip everyone in you party with auto-reflect. The next time you fight, pick a spell, Blizzaga for instance, and instead of attacking the enemy with it, attack your party using the multiple target command (R1 or R2), And Voila! It will bounce off your party and in doing so will quadruple the power of the spell and smack that grand-dragon, or whatever with some serious damage! If you know what elements your enemies are weak against it will usually always do around, oh...9999 points of damage. Just for a regular Blizzaga!
submitted by Ravishkra (Ravishkra@hotmail.com)
Get Vivi to dance
At the Main Menu screen hold R1 + R2 + X and press triangle.
submitted by slim
Changing Costumes
In the Ice Cavern when you fight the Black Waltz he'll summon an ice monster. If you succesfully defeat the Ice Moster before you defeat the black waltz he will give you a special item. Take this to the village of Deli and go to the Inn. There you can change your costumes. (I havn't tried this yet but I do have conformation that it works).