tiny game design

You won't see me playing idlers often, but I've recently installed  Hotel Empire Tycoon  and found an interesting retention mechanic : If you don't come back to the game within a certain period of time, your offline reward stops to accumulate. A friend of mine has told me, that lots of idle games use it for quite a while. But I write it down anyway. And the second that caught my attention is the monetization . You can buy a manager which will instantly increase this offline rewarded period.