Warning Spoiler Alert: This article or section contains details about plotlines not covered in the anime. Do not proceed unless you wish to be spoiled.

«Horizontal Square» (ホリゾンタル・スクエア, Horizontaru Sukuea?) is a 4-hit Combo, One-Handed Sword category Sword Skill in Sword Art Online, New ALfheim Online and Project Alicization. In Sword Art Online, the skill is unlocked when a player's «One-Handed Sword» skill proficiency level reaches 150.[1]


«Horizontal Square» is activated by drawing one's sword to the back and right. The first hit is a horizontal swing from right to left. The sword then bounces back, and after an instant of being held still at the user's left side, another horizontal swing from left to right is executed. The force of this blow sends the user's body spinning clockwise, with the sword ending up at the user's left flank and unleashing a third horizontal strike from left to right. The skill is finished with a forehand strike from the right. The skill's four swings draws a square of light that expands outward.[1]


Instance Description
Light Novel Anime Manga
Progressive Volume 3, Barcarolle of Froth, Part 8 N/A Having blocked a Forest Elven Inferior Knight's all three blows of Sharp Nail, Kirito noticed that his One-Handed Sword skill reached 150, thus unlocking Horizontal Square. As the knight was suffering a post-motion delay after the execution of Sharp Nail, Kirito activated Horizontal Square, and, although the final strike to the heart would have killed his opponent, he instead aimed for the elf's kite shield, causing the elf to be blown into the water.
Hopeful Chant Part 4 N/A N/A After decreasing the Hit Points of three Balloon Roussettes to half with regular attacks, Kirito activated Horizontal Square, defeating all three bats simultaneously.
Volume 1, Chapter 1 Episode 08 Aincrad Manga Stage.002 Kirito uses this skill to defeat a Lizardman Lord.
N/A[† 1] SII Episode 16 N/A «Horizontal Square» was one of the skills that Kirito chained while fighting against the Golden Minotaurus.
Volume 13, Chapter 9 Alicization Episode 17 Kirito uses this skill against an attacking gargoyle, severing its arms, tail and torso.


  • A modified version of Horizontal Square was included in «Dengeki Bunko Fighting Climax» as a special move used by Kirito. Regular versions of the skill can also be followed up with a variation of «Meteor Break».[citation needed]


  1. In the novel, Kirito used «Vertical Square» instead of «Horizontal Square» in this instance.



Skills and Magic
Default Sword Skills
mostly common in SAO, New ALO, UW
Avalanche - Cyclone - Deadly Sins - Embracer - Explode Arrow[1] - Fell Crescent - Flashing Penetrator - Horizontal - Horizontal Arc - Horizontal Square - Howling Octave[2] - Lightning Fall - Linear - Meteor Break - Meteor Fall - Rage Spike - Reaver - Savage Fulcrum - Senda - Sharp Nail - Single Shot - Slant - Snake Bite - Sonic Leap - Spinning Shield - Star Splash[2] - Starburst Stream[3] - Treble Scythe - Tsumujiguruma - Tsujikaze - Ukifune - Vertical - Vertical Arc - Vertical Square - Vorpal Strike - Whirlwind
SAO Dual Blades - Extra Skills - Fishing - Hiding - Holy Sword - Searching - Tailoring - Tracking - Unique Skills
ALO Original Sword Skill(Mother's Rosario (OSS))
Magic Butterfly Shield - Cold resistance spell - Concealment - Earth Wall - Fireball - Fire Spear - Healing Magic - Hit Point Buff Magic - Hollow Body - Ice Arrows - Metamorphosis - Moonlight Mirror - Night Vision - Purified Surface - Retrieve Arrow - Sacrifice - Searcher - Smokescreen - Strength Buff Magic - Vacuum Blades - Water Breathing - Wind Needles
Project Alicization Sacred Arts - Incarnation - Synthesis Ritual
  1. Only in ALO.
  2. 2.0 2.1 Only in SAO and ALO
  3. Only in SAO