Where would you store runtime game data?

Hi,
I was wondering what would be the preferred approach to store runtime game data.
Imagine you load data for one level of a game.
Where would you store this data? In a global Config, or in a Component that belongs to a global Entity? As a member of a certain system that needs this data?
I've seen the match3 sample uses cookies to do something similar, but I haven't found any documentation related to this.
e.g.

        static getSelectedWorldMapIndex(): number {

            let cookieName = "SelectedWorldMapIndex";

            let value = this.getCookie(cookieName);

...

Thanks for your input!