Upgrading All Walls

I just started playing new player. :) What about a way to upgrade All Walls? If you have enough coins that is.

Or even just whole rows at a time, so you can choose how many walls you want to upgrade at one time.

There is no way because after level 6 they cost 200,000

Just do it one at a time. It won't be too long before they get expensive enough that you can only upgrade a few at a time.