How app update works?

Hi there,

I want to ask about updating app. If I have a app where are several levels for example 20 and you have unlocked levels 1-12. Then I publish update where are next 10 levels (30 together). So how to secure then after update you will have unlocked levels then you already done? Thanks

My way may not be the most efficient, and it only works if you dont plan on distributing the update.
Start a new project, copy old project code paste it in new one then watch the levels you unlock in the old project , then save it as Global Project info, then open it in the new project.