This fine game titled Protect The Kingdom is genuinely worthy game which is available here absolutely for free. Protect The Kingdom has a vast list of categories, for example one-player and strategy and many more such as defense, tower-defense, cannon, kids, arcade games as well. This is an HTML5 game and games like these has no problems running on mobile phones. To operate, just use your finger on mobile and mouse and keyboard on PC to beat the score. Enjoy playing Protect The Kingdom online game for free on www.AiFreeGame.com.