From the Terra Battle official site[1], Terra Battle requires "iPhone4S or later", "iPod Touch 5th generation or later" or and "iPad2 or later" with iOS 6.0 or higher.
As for recommendations you may want to download an emulator and play that way. The people on http://terrabattleforum.com mention Andyroid for Android emulation and there may be an iPhone emulator that works as well.