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.

When you are in the battle, summon your lady Zombie to lure the monster. Then proceed to attack its weak spot on the back.

When you hear the heartbeat sound, stop and meditate to avoid vertigo effect from ghosts.

When the Goki attacks your character, press X to block the bite attack. Although it seems improbable, it is possible to deflect that attack.