Local Enemy Bestiary
Once you enter the cave, go north and speak with Siegfried. He’ll say that it is wise to stay back and let him go forward, clearing all of the vicious monsters out of your path before leaving to do so.
Don’t see why we’d stay here. I mean, there’s Gil and EXP. to be had! Not to mention some potential treasures that have to come from a secret way to the castle. Not to mention that staying here will do absolutely nothing but up the play clock.
So go along the path for a while until you reach an east/west fork. Head east, then north and through the northern exit. You’ll reach a tunnel; go along it to find the thieves at the dead end. Suddenly, they note the turtle in the water nearby. They opt to use it as a hopping stone to go across. Follow them; you will need to press the button when the turtle is in your path.
In the next area, head west to the next one, then repeat there, using the southwestern exit to find the oxygen-deprived Figaro Castle.