In "Pokémon Red" and "Blue", the player learns of Mewtwo's existence by reading research notes left in the ruined Pokémon Mansion on Cinnabar Island. The notes say that the island's scientists discovered a new Pokémon in a Guyana jungle, that they named it Mew, and that it later gave birth to a creature they called Mewtwo; the game's Pokédex entry states that Mewtwo was "created by a scientist after years of horrific gene splicing and DNA engineering experiments". Mewtwo proved too mighty to control, destroying the laboratory and escaping. The player is later given an opportunity to capture Mewtwo in the Cerulean Cave, which is accessible only after defeating the game's final bosses, the Elite Four and Blue; in the remakes "Pokémon FireRed" and "LeafGreen" this prerequisite was expanded, requiring the player to explore more thoroughly and record information on sixty Pokémon species before access to the cave would be granted.