Concentration card mini-game
After getting the snowcraft, use it north of Salamand. During the game in the snow area, hold Circle and press X(22).

Faster airship
Repeatedly press Circle until the airship flies faster. After that point, pressing Circle will toggle between slow and fast movement.

Easy HP and Strength
Go into battle, against Imp or another easy monster. Hit yourself with two or three of your characters, and cure with the other one. Do this a few times, then kill the monster(s). You will gain HP and Strength, which is an easy way to built up a character at the start of the game.

Easy weapon experience
To easily gain experience with a certain weapon, get two of the same weapon. Equip both to one person (left and right hands) and fight monsters in the area that you are in. You will get experience for each time you hit with that weapon. The same thing happens with a shield, but with a shield, you cannot attack with it.

Use the following trick to gain one weapon and armor level every fight for the characters in the first three slots. After the opening sequence, when you gain control of the warriors, leave town and get in a fight with a low level monster such as a Hornet or Goblin. If there are multiple monsters, kill all but one. With the characters in your party, select "Fight" from the command menu for everyone except the person in the fourth slot. Once you are able to choose a command for the fourth character, cancel the previous commands and then repeat the process over again. For example, choose "Fight" from the choices in the command list. Next, choose a target for your weapon to hit and confirm your choice by pressing X. Cancel the choice you made by pressing Circle. Repeat those three steps 100 times and you will go up one level per fight. Note: When you first start the game, you only have three characters in your party; you can only do the trick for the first two persons.