The enemies are getting smarter and smarter these days. No longer are they following a set trail heading right for your kingdom. Oh no, this time they are coming from below. Thankfully your kingdom is even sneakier and has found out their plan ahead of time in this free defense game for Android and iOS!
CastleMine from Mugshot Games combines tower defense with a little bit of old fashioned digging. Instead of mapping out mazes for creeps to crawl through or building balloon things on green green grass, you get to dig underground one block at a time. Uncover extra gold deposits, additional resources, or even nests of enemies as you attempt to defend your castle from the threat from below.