The Cheat Rock is, well, a massive rock that allows for cheating!
Inked > See Mary’s Retro Look.
Blessing > Blesses you with 15 Goddess Coins. ResetHer > Resets character roles and names.
SirenSez > Sets all character roles to the original. Autosave > Enables/Disables Autosave feature.
LokiKiss > Max out all trainable stats to level 5. Royalty > Change MC’s appearance to the Prince.
To know these have worked, you will hear a bell ringing sound.