Castle Knight is an action adventure game where you get to step up and try to save a Princess.  The princess needs your help to defend her castle because it is under attack.  Prepare to fight.  Make sure you have your sword ready and also your bow and arrows.  You will need them to fight off and shoot the enemy.  If you can hold off the hordes of bad guys attacking the castle you just might be the knight in shining armor that the princess needs to save her kingdom.  Collect coins so you can make upgrades to your castle.