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Sword Art Online Alternative Gun Gale Online IV 3rd Squad Jam Betrayers' Choice (I) (ソードアート・オンライン オルタナティブ ガンゲイル・オンラインIV ―サード・スクワッド・ジャム ビトレイヤーズ・チョイス〈上〉―, Sōdo Āto Onrain Orutanatibu Gan Geiru Onrain IV ― Sādo Sukuwaddo Jamu Bitoreiyāzu Choisu ＜Jou＞―?) is the 4th volume of the Gun Gale Online spin-off light novel series, written by Sigsawa Keiichi, illustrated by Kuroboshi Kouhaku and supervised by Kawahara Reki.
What awaits the favourites for the tournament is a field that sinks to the sea as time passes, an 【UNKNOWN】 area hidden at the centre of the map, and the conspiracy of a nameless team!And, just what is the special rule suddenly announced to all the players in the middle of the tournament!?