Clash Royale ranks players according to level and arena. The maximum level is thirteen, while there are ten arenas (including the Training Camp) in total in the game. A player wins by destroying more towers than the opponent, or by destroying the opponent's "King's Tower", which grants an automatic three "crown" victory. At the start of each game, each player is given a "hand" of four cards from a "deck" of eight cards selected by the player. Cards must be played in order to attack and defend. To play the cards, the player must have "elixir", which replenishes over time. Once a card is placed, a new card from the deck is drawn to the hand. Players unlock different arenas by acquiring a certain number of "trophies", trophies are acquired by winning battles. However, trophies can also be deducted by losing battles. Players may increase their "level" by "donating" or "upgrading" cards. A level increase also increases tower hit points and damage. The amount of experience points necessary to rank up increases with each level.