Pokémon Diamond and Pearl are role-playing video games with adventure elements. The basic mechanics of the games are largely the same as their predecessors. As with all Pokémon games for handheld consoles, gameplay is in a third-person overhead perspective, and consists of three basic screens: a field map, in which the player navigates the main character; a battle screen; and the menu, in which the player configures their party, items, or gameplay settings. Players begin the game with no Pokémon or Poké Balls, but are given the choice of three Pokémon as a part of the story line. Once Poké Balls are obtained, the player can capture more Pokémon. Players can use their Pokémon to deal damage to other Pokémon in battle. Whenever the player encounters a wild Pokémon or is challenged by a trainer to a battle, the screen switches to a turn-based battle screen where the Pokémon fight. During battle, the player may use a move, use an item, switch the active Pokémon, or flee. Fleeing is not an option during battles against trainers. All Pokémon have hit points (HP); whenever a Pokémon’s HP is reduced to zero, it faints and cannot battle unless revived at a Pokémon Center or with an item. If the player’s Pokémon defeats the opposing Pokémon by causing it to faint, it receives experience points. After accumulating enough experience points, it will level up; most Pokémon evolve into a new species of Pokémon whenever they reach a certain level. Pokémon’s stats also increase every time it levels up, and they will also learn new moves at certain levels as well. If a Pokémon is prevented from evolving it will learn new moves faster.