That said, right now the most convenient way to play all of the relevant Sword Art Online games is via PC or PS4.
Originally released for the PS Vita and PS3, then ported to PS4 and PC, 2015’s Sword Art Online: Lost Song takes place in the fairy-themed Alfheim Online (ALO), the game Kirito, Asuna and their friends gravitate to after escaping from SAO and Aincrad.
Sword Art Online: Alicization Lycoris is available on PC, PS4, Xbox One, and Nintendo Switch.
Sword Art Online vs. Accel World: Millennium Twilight is available on PC via Steam, PS4 and PS Vita.