Would get more stars if it wasn't for the unrelentless ads. They pop up literally every 30 seconds, preventing you from really getting into a grove of playing. It would be 100% better if the ads were at least during the time when you go to sell, upgrade, or travel. The constant ads made me not want to voluntarily watch them to get free upgrades or the railroad bucket. In a nut shell - The game experience is ruined due to excessive ads.