The winter limited version was released at the end of last year, too.
Most of how to play does not change, but designs are different. Moreover, we can harvest the nameko mushroom in connection with Christmas and Japanese New Year.
Furthermore, we can get cute wall paper for iPhone.
Developer of application Bee works released an Android version of this recently. It broke through 200,000 downloading from release in one week. It has broken through 3,3M downloads in those whole series(Nameko Saibai Kit:2,1M DL, winter limited version:1M DL).
They began character-goods sale recently.
This business model resembles Angry Birds of Rovio.