Like Sonny, Toss the Turtle and Newgrounds Rumble, Monster Castle is a Newgrounds Classic. It features great diversity of gameplays, unique towers, great design and it is an amazing challenge. Besides, the concept is very entertaining and inexpected, making it an excellent time waster. I´d like to point out some of the game´s "flaws" detected by the other gamers. Complains that the game is too hard are completely bullcraft. While challeging, it has three difficulties, and of course "Hard" is going to be hard. You can simply pass the game on "medium" or even "easy" without having to face the real deal. So its not actually hard, its only challenging. And upgrades? Really? Newgrounds Rumble is the best voted game around here and have no upgrades. This game was designed to make to player think about every possible combination and power up of every evolution, like how to make every tower passible of evolving (not overpowering the first row) besides the placement (essencially on hard), not just spamming your favorite, overpowered unit aong the way. Flawless. Faved along Sonny 2.