The aim of this game is to destroy the crown towers of your opponent using the cards a player has in his/her deck of 8, with the given time of 3 minutes. If either side wins or loses, a 1 minute overtime will be given. There are 2 lanes on which the player can launch his/her attack. Each lane is defended by a Princess Tower, and behind the Princess Towers is a King Tower. But what is interesting is that a player can directly attack the King Tower without having to destroy the Princess Towers beforehand if the player has the right cards. This King Tower is the heart of all the battle. If a player destroys his/her opponent's King Tower, the player automatically wins the battle, even though one or both the Princess Towers still stand. On the other hand, the same goes to the player, if his/her King Tower is destroyed, the player will automatically lose the battle. These towers have hitpoints and damage depending on player level.
When players win these battles, they earn trophies which will decide which arena are they in, the higher the arena, the more competitive it is. Players also win chests, and in these chests are the cards. There are 7 types of chest that can be earned from battles: Silver Chest, Golden Chest, Giant Chest, Magical Chest, Super Magical Chest, Epic Chest and Legendary Chest. There is also a Wooden Chest that can be opened every 4 hours. Also every time a player reaches a higher arena, there will be more cards waiting to be discovered.
There are total of 74 cards that can be collected to strengthen your deck. This cards are divided to 4 different rarities: Common, Rare, Epic and Legendary. These cards also have 3 different types: Troop, Building and Spell. There is also a shop that offers you cards, chests, gold and gems. The cards recycle every 24 hours.
Troop type of cards have attributes such as speed, count and targets. Building cards have attributes such as lifetime, spawn speed/production speed and range. Spell cards have attributes such as radius, duration and crown tower damage.
In this game, you can also form clans. These clans is the place where players can donate their cards to our clan mates, and where players can have a friendly battle against their clan mates just for fun without risking our trophies. Players can also chat with one another and sometimes there are clan battles where we battle alongside with one of our clan mates against 2 other players from another clan.
There are also limited time tournaments and challenges that can be played by a player after paying the entry fee. Usually, these tournaments and challenges give players rewards after they reach a certain point in it. These rewards can be gold, chests and cards. The tournament or challenge will end when you reach 12 wins or 3 losses, whichever comes first. Cards that are used in these challenges and tournaments are either leveled up or leveled down to these conditions: King level 9, Common level 9, Rare level 7, Epic level 4 and Legendary level 1. The overtime length in these special battles is 3 minutes to minimize draws.
I hope this has helped you understand more about Clash Royale. Good Luck & Have Fun!!!