You don't always need a Game Shark. Square hid some decent rewards inside the game itself.
Instantly unlock scenes in the gallery, which is normally accessed at the Soothsayer’s hut in the Market District. Alternative Methods cheat code for parasite black
While there isn't a button for infinite money, there is a loop you can exploit once you reach the Crafting system. You don't always need a Game Shark
The "cheat code" for the survival horror visual novel Parasite Black cheat code for parasite black
: The cheat menu must be unlocked during an active game. If you save and reload