Kenshin said:

Hello, 

From the start of playing the game till now. Lv 47. I have received 29 Special Building Upgrade. But I have never used them. How to use it? (I don't know) Does it use to immediately upgrade any building? 

Thanks.

Hello!

Could you please attach a screenshot of the Special Building Upgrade in question? Thanks!

Kenshin said:

Hello, 

From the start of playing the game till now. Lv 47. I have received 29 Special Building Upgrade. But I have never used them. How to use it? (I don't know) Does it use to immediately upgrade any building? 

Thanks.

Hello!

Could you please attach a screenshot of the Special Building Upgrade in question? Thanks!

Kenshin said:

Hello!

Thank you very much for the screenshot. 

Special Building Upgrades are used to upgrade buildings on different levels. They don't give any bonuses like a faster upgrade, they are used like any other resources.

Use them when you see that a certain building requires them (it may be on higher levels).