This game had a 5 star review, until I built the treasury. Every day you get optical diodes so you can upgrade the treasury. So far fine. Then came the treasury event. The treasury is fill with all sorts of goodies. One has to earn a bunch points to obtain the key. Then a key appears in the game purchases. $100 USD. Granted, there is a lot of useful stuff in the treasury, but to have to score a bunch of points and pay money? NOT COOL.