Gree announced the release of an official One Punch Man smartphone game which will be available in Japan (and later in China and other regions) on iOS and Android from 2017.
The game will be a free to play title but the exactly release date is unknown at the moment.

The game will be based on the 2016 aired One Punch Man TV animation but it going to includes some elements (story parts) from One Punch Man season 2 which going to starts in 2017.

More information coming soon! Stay tuned!