DefEndless is an endless tower defense game with four difficulty modes. You must create, drag, and combine stones to kill the enemies that are attempting to steal your gold. Place up to three stones on the map between each wave of enemies. There are five types of stones, which are chosen at random when they are placed on the map. Combine stones that are near each other to create special towers; stones that can be combined will have a yellow or green glow. Purchase upgrades and extra lives with the money that you earn each time an enemy is killed.