CastleArena.io multiplayer online Io game is available for you to play and experience a cool and fun match. Set in the middle of a forest, the combat that you are going to join will require you to beat the enemy as soon as possible to survive, become the winner, and rule that location. You start the challenge as a commander. Take control of a troop along with some essential structures. You should deploy them in the proper way to defeat the target. What you need to do to complete the mission is to destroy the castle of the foe and defend your fortress. Every action must be considered carefully. At the bottom of the screen, you can see several cards. Pick out anything available and put them in the allowed area. Note that these pieces cannot generate the income or wood. Additionally, you can upgrade plenty of abilities by tapping the green arrow. Improve them with the point and increase the winning chance after that. Good luck!