Free downloading is here.
The game apps linking with ONE PIECE Moja is these 3 kinds now.
ONE PIECE 麦わらピンボール マリンフォード頂上戦争(Pinball) 170yen
ONE PIECE 剣豪 ロロノア・ゾロ 歴戦の猛者達(Slash action) 170yen
ONE PIECE 海賊大富豪(Daifugō) 170yen
These are released as the native apps. When users clear a quest by each game, they can get the exclusive wall paper which are usable in ONE PIECE Moja. Bandai Namco Games that are these publisher are going to increase game apps that link to ONE PIECE Moja from now on.
I think that this is the plan that followed success of the messaging apps such as LINE and Kakao Talk. However, they make popular contents ONE PIECE the core of the service not a chat and message.