unplayable by registration compulsory!

However, as has been noted by others, forcing the game to register with Circle Game. If this denied, pop every few seconds on a window and requires re-login, no matter what is happening in the game. Would it not already annoying enough (this does not match the river on), it means the very probable death and the end of the game when enemy contact.
In addition, the registration compulsory is also essential, even through the data connection deactivated or use a firewall (blocking the app connection).

Incomprehensible, completely unacceptable to us so (unfortunately) a letdown.