Successfully complete the game to unlock two additional dungeons that can be explored.
On the second island that you reach when you are about the fight the Giantman, you will discover a healing light. When you are about to fight him, wait and stay in the area with the healing light. After every battle, go back and forward to heal there. When you are done you can return any time and do this.
Easy class mastering:
Find a spot where you can encounter enemies and use the spell titled Whistle to have instant battles.
Unlimited World Leafs:
Any time your party runs out of the hard to find World Leaf; go to the World Tree located in north present-day Krage. A small bird will fly down and drop a World Leaf on the ground for your leader to pick up. The World Leaf must be used before the bird will give another one.
Free Mystic Nut:
In the Orph region, before getting the woodsman to join your party, go to the back of his shed. Talk to the squirrel to get a free Mystic Nut.
Temple of Time:
When you get all of the Saints Parts ( Armor, Shield, Sword, and Helmet) go back to the entry and you will see the four Saints statue. In the first one, place the armor. In the second one, place the shield. In the third one, place the helmet. Finally, place the sword in the last statue. The seal door will open and you will enter. When you go forward you will see a book. Save your game now and proceed. You will see two torches, and the right one is blue. Take it, go on top of the big statue, and light that up. Do the same thing to the red torch, and next to both of the statues. It will tell you the whole puzzle to proceed on. In the next room, pick up the shard. Explore the area and pick up all the shards. Then, go to the northwest room. Fit in all the shards in the top left pillar and you will teleport to an island.
The new village:
If you are looking for people to join your village, go to the inns at all the villages. Walk in and out until you see someone walking around. In Falrod, they are in the church and in the inn. This will soon progress your village far, but do not forget to check on it every once and a while. You can find three priests, two nuns, three normal people, one cat, two fighters, one pig, two old people, and one musician. There is also a person that will make special statues of your people in the sixth village you go to. However it takes a while to find him. He is not at the inn -- he is around the village.
It is possible to defeat the Almighty One in just two rounds. All characters should be at Level 99. Also, master the Rosevine class (for the skill Megamagic) and the Woepriest class. Note: Use Hero, Aria, Melvin, and Maribel -- they have the highest MP points and Woepriest has the highest MP points of all classes. Equip everyone with the best attack weapons possible. Equip all characters with the Starry Bracelet (to ensure that everyone gets to attack first -- they are acquired in the Grand Slum casino). If you have the Memento, give this to Maribel (or the weakest physical attacker). Go into battle as Woepriests and cast Megamagic with all characters the first round. Note: The formula for the Megamagic skill is for every 1 MP you have, the enemy (in this case, God) will take 3 HP damage. At least two of your characters (at level 99) should have 999 MP, and the other two should be close. 999 HP times 3 equals 2,997 HP damage. After all four characters cast Megamagic, have Hero, Melvin, and Aria cast Sworddanc. Have Maribel use the Memento (although it is not really necessary; if you do not have it, cast Sworddanc or Ultrahit). God should fall within the second round. Note: Due to uncontrollable status ailments such as Sleep, Laughter, etc., this trick will work most, but not all, of the time.
Never ending battle:
Make sure you have the Time Sand in one of your character's item inventory. When you are about to lose a battle, you can use the Time Sand to reset the fight and continue with the same HP and MP that you started with. This even works when fighting Bosses, which is very helpful.