You are playing as the shop keeper for the heroes and you can play like an RPG game without the killing of monsters to get the items.

However that said, the grinding is the crafting of items until you can expand your shop & city into a bigger & profitable one.

Shop Heroes website
http://shopheroes.com

iOS: https://itunes.apple.com/app/id938185444

Android: https://play.google.com/store/apps/details?id=com.cloudcade.shopheroes

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