Kingdom Rush: Frontiers is full of secrets, geeky references, and deep, addicting strategy (review)

Whenever I mention Kingdom Rush — say, via social networks — someone usually responds with some sort of reverence for the tower-defense game. People just seem to love it. Need more proof than a few remarks from my circle of online buddies? As I mentioned before, nearly 25,000 players gave it an average five-star rating on iTunes. Hey, I can relate. My personal addiction has led me to finish every stage and every challenge in Kingdom Rush — three times over.