Legend of Mana. It gets a lot of praise but not by many people. It had a great disjointed story and a unique world that you built. Not to mention the combat/weapon system was fabulous beyond belief. One of the few games were the strategy guide came in hand for years. Eventually people figured out some tricks to it with customization of weapons.

Great game with some of the best 2D gameplay and art the PSX had to offer...ever.