Can't find data folder of an installed game I've installed a game through Google Play and I would like to analyze data files to see where information about progress are stored, but I can't find any folder of the game itself. 

In sdcard/Android/data there is no game folder. Wehre should I look?
Applications keep their data in /data/data. It is a folder that resides in a partition that a normal user can't access. In order to access there, you have to root your phone and download another file explorer application that can browse /data.

I'd personally suggest Nextapp FX File Explorer with Root Add-On or ES File Explorer.