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Hay Day-How to upgrade service building slots?-[Hay Day English]

Are you having trouble upgrading your town building? Here’s how you do it!
For example, if you want to increase the visitor slots in the grocery store, just follow these steps:
* Tap on the ‘Grocery store’
.
* Next to the visitor slots you will notice a green arrow mark with ‘+’ symbol. tap on it.

* Tapping on the green arrow brings up a pop-up window with 4 upgrade possibilities.

* Visitor slots: tap on this to upgrade the number of visitors you can serve in the Grocery store at the same time.
Also make sure that you have enough number of the required materials in order to upgrade the slots in the buildings. The procedure to upgrade the visitor slots remains same in all the service buildings, though, the materials required might be different.