Sword Art Online Progressive 5 (light novel)

After successfully untangling themselves from a dangerous encounter withthe Black Poncho Man and clearing the fifth floor of Aincrad, Kirito and Asunahead to the next challenge, an area filled with...puzzles? What's more,because of the precarious balance of power between two large guilds aiming forthe same item, "The Flag of Valor", there's also a murderous PK group to be waryof. As the problems seem to pile up, Kirito and Asuna face the sixth floor ofAincrad completely unaware of the malicious trap awaiting them!!