This is a great game that deserves six stars, except for one major flaw: the "free" gems offerwall is severely busted. I have two completed offers totalling over five hundred gems, yetwas never rewarded. The offers have sat there nearly a month before iron source finally got back to me and told me to contact the game itself and tell it I need my payment. So here I am.... Will definitely adjust this rating if this issue is fixed. Until then, don't waste time trying to earn things that won't show