Permanent Internet connection required! What ???

The strategy game Train Yard is quite entertaining. By skillful construction of railway lines must be one or several trains run to their destination without colliding while driving with other trains. Some of the routes have to be built on the cross, that to get to the goal. When multiple trains are involved, in some cases course must be set to run the train from start to finish.

What I can not understand that when making a purchase game a permanent Internet connection is required and the blocking of the game through a firewall playing is not possible! The game then terminates with an indication! This is unacceptable !!!