According to Bandai Namco 's own official website , the mobile game Sword Art Online: Memory Defrag will have its server shut down on August 30th.
The game is an RPG and features several characters already seen in the anime, as well as original versions of the characters created exclusively for the game.
Sword Art Online: Memory Defrag launched exclusively in Japan in 2016, and later worldwide in 2017.
Source: ANN
