Rhinos I have played two of the games you mentioned. I just tried the CSR 2 game and it works fine for me. As the project account said, you must be missing something or have something configured in such a way that causes the app to not work.
I just created a new profile, installed Sandboxed Google Play and its dependencies, logged in to Google Play, installed Google Play Games, installed the game, then played the game. It made me create a Google Games username.
So, make sure Google Play Games is installed, you're logged in to Google Play, and all related apps have network access.