Namco Bandai have revealed that One Piece Grand Collection has acquired over a million users. The feat was reached in just four days after the mobile social game was launched.

One Piece Grand Collection is playable on the popular Mobage mobile social platform. The free-to-play game is based off of the popular manga and anime series and lets players collect figures of their favorite characters from the series, and face off against rival boss characters in battle.

Source: Andriasang.com