Watching ads in the mobile game township

Usually when you have not played a while (for an hour) and you go in the orders of the citizens you see … nothing special.
But if you go out and then do one thing for the orders, then go back and it is very likely that you will see the movie director that lets you watch movies
Usually you can then watch 3-4 ads one after another, which gets you 2-3 township bills.
These township bills you can not only use to use your products faster but also to produce ingots even when you have not enough or no ore at all.
The ingots are usable to create coins or to get the high value items from the islands.