Run without being attacked
By tapping on the circle button while moving, your character will move much faster than while walking. This allows you to move fast without running, so the gaki never detect you. If done correctly, no meditation is needed.
Sugoroku mini game
You must collect the Sugoroku pieces from the Yin Phase and save, then collect the Sugoroku Board from the Yang Phase and save as well. After that, the mini game will be accessible thought the main menu. You can also collect the items vice visa.
Insane difficulty...