A day after the Age of Ash challenge ended, I used some codes which left me with a surplus of Institutes of Volcanology- six in all. I do not have enough land to use them all, nor do I see a need for so many- that challenge is now long gone. Since I don't expect to spend too much time at a stretch playing the game to keep taking coins every 20 minutes, I'm better served by the Chess Clubs and Perfume Stores that generate more coins. How many have ended up with such a surplus? And what can we do about it?