The floor consists of mountainous terrain and plains. The area around the Labyrinth is mountainous with thick, overgrown forests full of old trees, which are covered in green lichens and have numerous vines dangling from their branches. A meadow of blue flowers grows between the forest closest to the Labyrinth and the Labyrinth itself.
The entrance to the Labyrinth is carved into one of the mountains of the floor. The interior of the Labyrinth consists of obsidian-like stone walls and floor, various brown, white and multicolour paths stretching in all directions with dead white trees growing along the paths.
The floor was reached in the first days of October, 2024, after the 73rd Floor Boss was defeated. Active exploration of the Labyrinth began on October 9, 2024, while the Boss Room of the Labyrinth was discovered 9 days later, on October 18, by Kirito and Asuna who had made a party for the day. Although they retreated to a safe area after seeing the boss, they were forced to fight it that same day without a strategy meeting or a proper raid party, due to a party of the Aincrad Liberation Force led by Kobatz assaulting the boss without any help and ignoring warnings about the dangerous boss from Kirito. After the boss had already killed 3 members of the Aincrad Liberation Force, including Kobatz, Asuna rushed in to protect the remaining members of the guild from being killed by the boss, with Kirito and the Fuurinkazan members following after her. As the boss room was the first to include an Anti-Crystal Area, it was impossible to retreat safely from the boss room, thus Kirito revealed his secret Dual Blades skill to defeat the boss with his high-damage skills before it could finish him off. With just a few dots left in his HP bar, Kirito managed to defeat the boss with one of his high-level Dual Blades Sword Skills, Starburst Stream.