User blog comment:Kushieda minori/Game Update note May 10, 2016/@comment-25474140-20160511085640/@comment-25763904-20160511120638

Well 3k jewels are a lot for free player. I am still doing some simulations what is better. Upgrade castle to 11 and build the iron/gold/ether after to increase kingdom a bit faster.

the kingdom extensions solve at least the resource overload for a while.

AND most important I think: I want more sticker!!!