Sword Art Online Black Swordman Ace is an Open World MMORPG game with good graphic quality. It is released only in some countries.
It also has great character customisation and you can choose between 6 character.
Note: now it requires Chinese identity to login. Please wait for global version.
I'll update the links here.
Info & Download Links
Online
Size: 5.1GB
Android: https://www.taptap.io/app/197409?hreflang=en_US
Or
https://apkcombo.com/sword-art-online-blackswordsman-ace-cn/com.bilibili.sao/
iOS: https://apps.apple.com/cn/app/id1518791926 (use china VPN to download)