They released a puzzle game "Monpani" and a shooting game "Magical Glider" in the beginning.
...Well, This resembles LINE and Kakao Talk closely very much.
mixi was the Social Networking Service that took in a social game earliest in Japan. However, unfortunately they are overtaken by GREE and Mobage, and overtaken now by LINE. Furthermore, they are becoming outdated as social networking. Therefore they renew a social game platform and bet it on revival.