Description from the publisher: At the Horribilorum Sorcery Academy for Witty Witches and Wizards, we are not afraid of ghosts! Potion Explosion: The Fifth Ingredient introduces a new spooky ingredient: Ghost Ectoplasm! But don't panic as the new Professors will teach you how to handle it safely and use it to brew powerful new potions! This expansion for Potion Explosion steps up the game to a whole new level! Thanks to the fifth ingredient acting as a joker, players can now trigger even more incredible explosions to prepare their potions. Four new potions allow for even more diverse gameplay! On top of this, new Professors dramatically change the way of brewing potions!