Kingdom Rush is a tower defense game developed by Ironhide Game Studio and published by Armor Games, released as free flash browser game on July 28, 2011, on the iPad on December 19, 2011, and on Android in May 2013. Kingdom Rush is a tower defense game set in Medieval times. There are empty lots set along the pre-determined path where the player can build towers. There are four towers to choose from: Mage, Archers, Barracks, and Artillery. At the beginning of each level, the player starts off with a certain amount of money in order to buy towers.