Here are a couple of hints and secrets in Final Fantasy IX.

¤ Black Jack Mini Game

There's a game of Black Jack hidden in the end of the game. To play it you have to enter the following combination when the Crystal Theme plays at the "The End" screen: R2, L1, R2, R2, Up, Right, Circle, Down, Triangle, L2, R1, R2, L1, Square, Square. When you entered it correctly you'll hear a sound effect. Press start to play Black Jack.

¤ Level Up

If you want to level up fast on disc 4, try fight against Yan. They can be located on Vile Island (island west of the Iifa Tree). You can get a lot of EXP from a couple of Yans, but they are quite tricky. Especially Snort and Meteor.