Core gameplay: Castle Fight is a strategic building game. In this game player will first use different blocks: weapons, shields and buff, to build a castle, then the player will observe how his castle destroys the enemy, or gets destroyed. Before the game Players can choose their commander, each commander has a unique skill. Players can also customize the block set as they like, such as changing the block's function and its ratio in the block set. During the game The game has two phases: Building Phase and Battle Phase Building Phase In the building phase, players need to build a castle with tetrominoes. These blocks have different uses later in the Battle Phase. Battle Phase In Battle Phases, the fight will automatically happen after the building time is up or both players’ castles are reaching the limited height. Based on the strategy that players built in the building phase, each block will apply its utility. In this phase players can use the commander's skill.