The Water Castle is a Samurai fortress and the third to be seen in the game. The boss of this castle is Timid Swimmer. It is also the first appearance of the Hatted Samurai.


The fortress is flooded by the time Hiro arrives to it, and is more compact than other castles. The player progresses the level not by land but usually on rooftops or in the water. Towards the end of the lever there are stairs flooded with water, making a sort of waterfall the player can walk up. The end of the level is the top of the castle, where a door leads down flooded stairs to Timid Swimmer.