How do I save my game ?

How can i save all the game coins and gems that player has already purchased ?

When the player change his device or reinstall the game.

do you have any information to do that ?

Hi ! You can save data using Local Storage Plugin !

Here is a tutorial for save data in c2 but it work in c3 :

youtube.com/watch

Good luck

but when a player change his device or removed the game and reinstall it again will lose the purchased coins

Hummm... I don't know but I think you have to use Google Play Service...

If the game is on phone of course

I think there is no game service on Construct 3 google play service addon