Have been playing this for a couple of months..unlike some folks I have had no problems with system crashing. I like the fact that game does not depend on you making alliances with others to progress and the fact there is no war or hostile activities ...have enjoyed building my city to its current level....however game is getting expensive due to excessive nn for rubies...new industies have become excessively expensive to build and rewards for meeting goals have not kept pace..like one reviewer said, the developers are greedy and have tilted to game so that you must buy rubies to procees.dI have made my last purchase and will quit the game once I need to buy more...too bad as aside from that it is very enjoyable