Accel World vs. Sword Art Online: Millennium Twilight is an action role-playing video game developed by Artdink and published by Bandai Namco Entertainment for the PlayStation 4, PlayStation Vita, and Microsoft Windows. It is based on the Accel World and Sword Art Online light novel series.
Accel World vs. Sword Art Online: Millennium Twilight is a team-based game (with all voiced dialogue in Japanese with English subtitles), where any of the three members can be switched at any time, each with their own attacks and abilities. To make a progress in the game's story mode, there are numerous main quests to complete. There are also side quests that are not necessary but will make playing the game much easier, thanks to the rewards and additional experience. Inspired by Sword Art Online: Lost Song, combat consists of melee (Accel World characters), learning skills, and occasional flying for aerial combat (Sword Art Online characters). All battles take place in an open environment the moment a contact is made with enemies. There is a hub called the Floating City of Ryne, which contains shops that allow for improving characters.