Before selecting a battle, you can select "Simple" or "Regular" difficulty. However, upon selecting both, I didn't really notice much of a difference. Simple was still quite challenging with the same attack patterns as regular.
Is it something a bit more subtle? Like the boss has less HP or something? Does it vary between bosses? (I really only tried it on the frogs in the first world)
Best Answer
Simple mode removes a lot of attacks from bosses and sometimes even omits entire stages of a fight. However, you will not be able to play or progress to the final part of the game because on Simple you do not collect the souls from bosses. You need every boss soul to progress.