Royal Defense

Tower defense of the classical sort: a road, waves walking down it, and marked spots where you may build. Archer towers, magic towers, artillery and barracks each answer a different problem, and the upgrade you buy halfway through a wave usually matters more than the layout you started with. Royal Defense adds heroes you summon and spells on a cooldown for the moment a wave gets past the second bend. Stars for a clean clear, and the unlocks they buy carry into the harder maps.