In this game you have a precious dragon heart in a glass cube. Your goal is protect his heart from the evil king who wants to capture it. You can build a tower dropping different blocks from above. The last block is the heart. The enemies will need to destroy other blocks to get to the heart. You can kill the enemies with your sword or with your magic. You only have the sword in the beginning. Move it close to an enemy and click to cause the damage. You can unlock various spells clicking on their locks during the fight. When you unlock the spells you can use them pressing their number keys. When you defeat the next wave of enemies you can continue building the tower. You'll notice that some blocks have special effects or functions. You even have cannons and extra hearts.