I found such a good strategy. First, you place A LOT of libraries on the map, then you use your great scientist. Each library increases storage by a whole lot.
Dragon den is a ripoff. there should be a button to just leave with all of your rewards you already have instead of playing it risky. I got 2 diamonds twice but then, I hit a bomb and lost all of the diamonds.
who is going to spend hundreds of diamonds to speed up a crop when you can go to the market and spend 75 coins? Only dummies will speed up their crops.
It's surprising but you can get land that cost diamonds without spending $$$! I have 237 diamonds without using kreds and only 3 more till I get the (tiny) magic island. also, im on lvl 12
 "Supply Chain Idle"){kind=icon}
 "City Idle"){kind=icon}
 "Bloons Tower Defense 4"){kind=icon}
 "Mergest Kingdom"){kind=icon}