The additional rewards for clearing a Stage twice in each Adventure Area can be received in normal mode as well.
However, you have to clear all the Stages in hard mode to get the Star Flowers.
What is Adventure Hard Mode?
In Adventure Castle, what is the difference between White Flower and Star Flower?
However, you have to clear all the Stages in hard mode to get the Star Flowers.
What is Adventure Hard Mode?
In Adventure Castle, what is the difference between White Flower and Star Flower?