Here you can play Kingdom Rush 3 - Kingdom Rush Frontiers for free! If you need some help, you can find helpful tips here. Enjoy:). Kongregate free online game Kingdom Rush Frontiers - The world's most devilishly addictive defense game is backwelcome to Kingdom Rush. Bigger and badder than ever before, Kingdom Rush: Frontiers is a whole new level of the furiously fast, charming gameplay. Alien Cat Dragon Monster Ninja Tower Defense War Escape Zombie. The default and main mode is Campaignthe story mode of the game. Your basic troop type options are: It's like another game. This website is not endorsed by or affiliated with ironhidegames.