ORX is a combination of tower defense and card game in which you have to defend your medieval castle from an attacking horde of orcs. In the game you have to go against an army of green-skinned invaders using decks of cards. During the combat phase, you can turn the tide of the war with the help of special cards that strengthen your defense or slow down the attack of the orcs. As you progress through the campaign, you will receive new cards (there are more than 300 of them in the game), and will also gain access to powerful artifacts that can radically change the deck and the course of the game.