Its a very fun and addictive game and I have spent many hours playing since it was first released. I would've given five stars if it wasn't for the fact that the "Space Shooter" Unity ad that appears when doubling collections on missions or opening silver chests never issues the reward after watching or playing it so I have to keep pressing the watch ad button repeatedly until I get a different ad that does reward me. Please ask your ad provider to remove or fix this ad please Sega Hardlight!