Oh! Sorry for your question! 😔 I think this notice of upgrade round hammer isn't worked or still testing to all of the players!
I have received this notice many times but I haven't seen my round hammer is really not upgraded too! ✋
If you want the round hammer upgraded, you must complete 15/20 levelsofanyone city(one city) when you choose booster or live recharge twice fast on anyone city! Then you can see Power up the Hammer (double the radius) 🔨, you can click it on city's ticket! 😉 Now when you start to play levels, you have received the round hammer have upgraded to double the radius but you can play with the round hammer have upgraded on anyone city (one city) only! So can you got it and understand it? 😉
And I also give you exciting news on this game, you don't forget to join this game's contests to chance to win Gold Bars! 😊 So click here with a chance to win Gold bars! ** You can see "Announcement" , that means you can join it to chance to win gold bars. And "Finished" , that means that contest is over or finished! **
I hope you can join this game's contests and have a SASSY day! ❤️