Could we earn some bitcoins from that game or.. is it just for fun ?
It's for fun, but at the end of the round, the top players will earn a total prize of €200 (paid by Bitcoin or PayPal and other options). I thought it was a game where you could earn satoshis for playing, but it's not. However, the game is super fun, and a good way to pass some time when you're on the computer!
I cannot find anything about the rankings of the top players, or the prizes they will eventually get...Check this link for more information: http://freehourlybitcoins.com/mobstermaffia.png
And within the game, you can click the "M" icon on the bottom left of the screen, and in the rank popup window, click your country flag to toggle the "country" setting to "global". You can see the global rank from there.
