The basic mechanics of Sapphire are largely the same as their predecessors. As with all Pokemon games for hand-held consoles, gameplay is in 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. The player begins the game with one Pokemon, and can capture more using Poke Balls. The player can also use their Pokemon to battle other Pokemon. When the player encounters a wild Pokemon or is challenged by a trainer to a battle, the screen switches to a turn-based battle screen where the Pokemons fight. During battle, the player may fight, use an item, switch their active Pokémon, or flee (the last is not an option in battles against trainers). All Pokemons have hit points (HP), when a Pokemon's HP is reduced to zero, it faints and cannot battle until it is revived. If the player's Pokemon defeats the opposing Pokemon (causes it to faint), it receives experience points. After accumulating enough experience points, it may level up. Most Pokemon evolve into a new species of Pokemon when they reach a certain level. Apart from battling, capturing Pokemon is the most essential element of Pokemon gameplay. During battle with a wild Pokemon (other trainers' Pokemon cannot be captured), the player may use a Poke Ball on the wild Pokemon. If successful, the Pokemon will be added to the player's active party (or stored if the player already has the maximum six Pokemon in his/her party). Factors in the success rate of capture include the HP (and/or status effects such as Paralysis or Sleep) of the target Pokemon and the strength of the Poke Ball used. The lower the target's HP and the stronger the Poke Ball, the higher the success rate of capture is.