Tests of Persona is an unique quest that mixes up RPGs (early FF games especially), Zelda 1 and Zelda 2. The overworld is RPG-styled, while dungeons are Z1-styled, and towns and caves are Z2-styled. This quest features an unique personality system. At the start of the quest, you are given questions. Depending on your answers, you will get one of 13 personalities. What do they do? Well, they are basically like bonuses for the game. One personality might give you an extra Heart Container, while other one can give you more magic.
PLOT (SPOILERS):
Link is contacted by the Goddess of the Dream World and taken to a new world called Tarmasia. He learns that there are two worlds in Tarmasia: the Floating Continent and the Surface World. World Tower is a tower connecting these two worlds together, located in the middle of the world. Something in the tower is pulling the two continents together, and if that is not stopped, the Surface World will be crushed by the Floating Continent. Link has to stop this force.