Pokémon FireRed and LeafGreen  As in previous games, the player controls the player character from an overhead perspective and participates in turn-based battles. Throughout the games, the player captures and raises Pokémon for use in battle. New features include a contextual help menu and a new region the player may access after a certain point in the story. The games received mostly positive reviews, obtaining an aggregate score of 81 percent on Metacritic. Most critics praised the fact that the games introduced new features while still maintaining the traditional gameplay of the series. Reception of the graphics and audio was more mixed, with some reviewers complaining that they were too simplistic and lacked improvement compared to the previous games, "Pokémon Ruby" and "Sapphire". "FireRed" and "LeafGreen" were commercial successes, selling a total of around 12 million copies worldwide. As with all "Pokémon" role-playing games released for handheld consoles, "FireRed" and "LeafGreen" are in a third-person, overhead perspective. The main screen is an overworld, in which the player navigates the protagonist. Here, a menu interface may be accessed, in which the player may configure his or her Pokémon, items, and gameplay settings. When the player encounters a wild Pokémon or is challenged by a trainer, the screen switches to a turn-based battle screen that displays the player's Pokémon and the engaged Pokémon. During a battle, the player may select a move for their Pokémon to perform, use an item, switch their active Pokémon, or attempt to flee. All Pokémon have hit points (HP); when a Pokémon's HP is reduced to zero, it faints and can no longer battle until it is revived. Once an opponents Pokémon faints, all of the player's Pokémon involved in the battle receive a certain amount of experience points (EXP). After accumulating enough EXP, a Pokémon will level up. Capturing Pokémon is another essential element of the gameplay. During a battle with a wild Pokémon, the player may throw a Poké Ball at it. If the Pokémon is successfully caught, it will come under the ownership of the player. Factors in the success rate of capture include the HP of the target Pokémon and the type of Poké Ball used: the lower the target's HP and the stronger the Poké Ball, the higher the success rate of capture. While "FireRed" and "LeafGreen" are remakes of "Red" and "Green" ("Pokémon Green" was only released in Japan, whereas the international variant was "Blue"), they contain usability enhancements such as a contextual tutorial feature which allows players to look up data at any point in the game.