Location from Sword Art Online by Reki Kawahara
A fairy flight VRMMO built on SAO's engine — where nine fairy races war over territory and the World Tree's crown hides a prison disguised as a quest reward.
ALO was originally a repackaged SAO — same game engine, same underlying architecture — launched by RECT Inc. after the death game ended. Sugou Nobuyuki used its infrastructure to trap 300 SAO survivors in the World Tree's upper levels for brain-manipulation experiments. After Sugou's defeat, ALO was rebuilt as a legitimate game and became the main VR world for the series' cast. It's lighter than SAO — death means respawning, not dying — which makes it both less dramatic and a healthier space for trauma survivors to play in. The nine fairy races provide PvP faction warfare, and the flight mechanics are the game's signature feature. For the SAO survivors, ALO is complicated: it uses the same engine that held them hostage, but it's also where they reconnected and healed.
A vast fantasy world of forests, mountains, and floating islands, organized around the massive World Tree at its center. Each fairy race has a home territory with distinct aesthetics: Sylph grasslands, Undine waterways, Spriggan caves, Salamander volcanic zones. The sky is always visible and flight is the primary traversal method — players with butterfly-like wings soar between floating platforms and through open air. The visual palette is bright and colorful compared to SAO's grounded medieval aesthetic.
Also known as: ALO, Alfheim, Alfheim Online