This is an excellent game which should have 5 stars, but it's not playable without money. It should be playable on easy level (has 3 lvl diffilcuty per level) - but no real update to get stronger can not be achived through normal playing in the game in some standard amount of time. Standard amount time should be let's say 1:7 days, not 1:100 days if you don't pay. So if you do want to pay for your joy in playing, this is an excellent game, but if you do not, just skip it, levels become to hard