3star for only 1 reason. Either give me "$5 for ad free" or "Skip ad, and grind". Don't just force us to have an ad every 5 tiles. This game is SO cool for what it is. But I'm an adult, I'll give the 5 for ad frer. Let the f2p school kids and cheapies watch 70 ads. It's enough to make me quit on world 2 at this point. You could keep "ad for 100 of ths resource" and still let us pay to not have random ones.