The key chests are so obviously rigged its insulting. Theoretically you should have a 1 in 3 chance to get the best item but after 20+ attempts I didn't get it even once. Could have been a great game but I shouldn't be penalized because the game doesn't recognize sand dunes as something you would find in a desert. It should tell you ahead of time if it will accept your answer not finding out when it's too late. Also the ads are just way too numerous.