Age of Defenders - Multiplayer Tower Defense and Offense post apocalyptic RTS HD to give this its full name is another well rated game and this is its first time free in its history. iPad only https://itunes.apple.com/gb/app/age-defenders-multiplayer/id960361437?mt=8&ign-mpt=uo%3D4 https://www.youtube.com/watch?v=9C1z1BUdLvE
You must log in with facebook to "get access to full single player campaign, multiplayer battles, player profiles, leaderboards and chat. " Delete. Next.
I don't believe that you need to have internet or facebook to continue. I am in the sixth mission - single player only and it didn't ask me for any internet or facebook at all. So far it's good. Even in appshopper description mentions anything like this..