Easy Experience and Levels in World 2

To get a relatively easy 2500 experience points and 5 AP in the second world, go to the Sealed Castle, the one with the legendary weapons. The random moster in there, an undead-looking dragon, is very powerful and is probably not meant to be defeatable at that point. However, if you have a character that can use the Control action you can defeat him with litle or no damage.

He might resist being Controlled a few times, so perhaps multiple, fast characters with the ability might be useful, but one was enough for me. He might get some attacks in before you Control him successfully, though, so prepare to heal your party and possibly cure them from the Zombie satus effect.

Once you successfully Control him, he has two attacks you can make him use on himself. DON'T make him Attack himself, or he'll break out of your Control. On that note, don't let any of your party members attack him either for that same reason, plus they wouldn't make much of a difference anyway. Instead choose him Flame attack, which will deal 4999 damage to himself! And since it's magic, he won't break your Control. He seems to have about 20,000 HP or more, though, so it'll take five Flames to kill him. This worked for me consistently, but just remember to save often in case things don't go your way.

Learn your game stats

Take your airship slightly south of the Town of Karnak and submerge underwater. Enter the cave you see and talk to the man inside. He claims to be a psychic and will tell you how many battles you have fought, the number of enemies you've killed, your party's average experience, the percentage of the game's treasure you have collected, and the number of times you have saved your game.

Killing carbunle in 1 hit

If you have a mystic knight on your party, cast Fire 3 and in the next round hit Carbuncle with it. It will not show any damage, but it will kill him.