Though it's extremely addictive, but i am extremely unhappy. You need gems to play and they are not easy to get. Secondly, another thing you need to keep playing is fuel, which again is not easy to get. So, now you can imagine how hard and slow this game must be. If this wasn't enough, it would show server error all the time, which means loosing what you have earned in the middle of the game. I have never been this frustrated with any game.