We would like change Goddess of Math from 0.99 USD (which is quite cheap already) to free, because we want more customers to enjoy this game. Another reason is that we will have Goddess of Math on some other platforms which will also be free. We would like to keep all the platform have the free Goddess of Math.
Thanks very much for your understanding! Thanks very much for all the players who bought this game!

Please don't buy the game until it is set to free.