Sword Art Online: Fatal Bullet is a   developed by  for the , ,  and  based on the   series. It is the fifth game in the series and is the successor to the 2016 game . The PlayStation 4 version was released in Japan on February 8, 2018, with a worldwide release on PlayStation 4, Xbox One, and Microsoft Windows on February 23. The Nintendo Switch version was release as a Complete Edition, including all DLC, on August 8 in Japan and August 9 worldwide.

Taking place in the   (VRMMORPG) Gun Gale Online, Fatal Bullet features an alternate timeline to the light novels and anime.

Unlike past installments, Fatal Bullet features original character creation and the usage of firearms in battle, though other weapons like 's photon sword are also available. As the player progresses through the story, they can also unlock the ability to dual-wield a gun and photon sword in a similar manner to Kirito. A  and role-playing game hybrid, players can level up and gain skills as the game progresses. While fighting, players are provided with a wire that can allow them to quickly move around; although the wire is not in the canonical Gun Gale Online, a Bullet Line system – which serves as an assist in defending the user – is included in Fatal Bullet.

The game features multiplayer, which allows players to form four-man  or fight against one another in four-on-four  (PvP) matches. In PvP deathmatches, players are split into  teams, fighting each other in addition to computer-controlled enemies.

As in previous installments, the player can engage in bad conversations with other characters; as Kirito, one can do so with those in the canon, while the protagonist avatar has such dialogues with characters from the game universe.