Easier Upgrading Walls

Some people will say its better single but some people doesn't have that much time and wants to upgrade their walls very quickly. So when you choose select row, there's another tab saying "Upgrade" and then the price of the number of walls selected.

Tell me below of what you think

Its a good idea but it might be a little hard to implement into the game, however I don't know as I'm not a Game Devloper so I wouldn't know

Hey, in future please use the search function as this has been requested multiple times.