‘Upgrade’ is constantly greyed out.
I’ve accumulated tens of thousands of coins and can’t seem to spend them.
I have almost zero gem-things.
I can’t change coins for gem-things.
Is the game principle here that you must simply have ‘enough’ coins to pay the upgrade price once you’ve eventually earned it through victories (and ONLY through victories etc) etc?
Or are you supposed to be able to purchase upgrades with coins as and when you have the coins.
Can you somehow use coins to buy gems?
If not then why/how have I generated this surplus coinage?