The Good: Kingdom Rush Frontiers brings more of the same great gameplay from the original with new towers, new monsters, and plenty of action in the latest update. The Bad: The premium heroes are expensive. The Bottom Line: Fast and exciting gameplay makes Kingdom Rush Frontiers a must-have pick for tower defense fans. Kingdom Rush Frontiers is the sequel to hit tower defense game Kingdom Rush, keeping the same great gameplay with fun improvements and extras. The latest update adds even more to like, including new stages, enemies, and a challenging boss fight. Just like the original, Kingdom Rush Frontiers is set in a fantasy world where you'll battle cartoon-like mythical monsters hell-bent on destroying your kingdom. As a fixed-path tower defense game, you'll be required to choose from four different types of upgradable buildings with varying damage types to keep the evil invaders at bay. Each level has a set number of available emplacements, so it's important to choose your towers wisely.