The world's most devilishly addictive defense game is back - welcome to Kingdom Rush: Frontiers!īigger and badder than ever before, Kingdom Rush: Frontiers is a whole new level of the furiously fast, enchantingly charming gameplay that made the original title an award-winning hit. What does Kingdom Rush Frontiers HD do? Now for Mac! Full HD version of KRF, all Heroes will unlock for free! NO IAP on this HD version of the game.