We've mentioned Kingdom Rush Frontiers here a few times before, so odds are you might know a little something about it already. But the long-awaited sequel / expansion to one of the best tower-defense games on the App Store has now gone live, for US$2.99 on iPhone and $4.99 on iPad, and you can now download it and defend towers to your heart's content.
Kingdom Rush has been on the App Store for a while (it originally began life as a Flash game), and Frontiers takes the winning formula of unit-based tower defense, and adds a whole lot
