The longer I play this game the more my rating for it goes down. I have been trying to complete stamp #5 for AT LEAST 4 months now & am still missing 5-12 (I realize it's the rarest in the pack, but still). I'm at world 11 & x8 stamp packs cost 314k each... I'm playing less and less now. I used to play everyday. When I do play I spend a minimum of just over 3mil. (10 x8 stamp packs) each time. I have all the creatures but don't want to finish upgrading & move on b/c the price will go up. :(