In the game, the unnamed player character fights a series of one-on-one battles in a derelict castle to face the immortal God King.

Infinity Blade was intended to demonstrate the new iOS version of the Unreal Engine, and to combine the combat of Karateka and Prince of Persia with the loneliness of Shadow of the Colossus.

[1] In the primary portion of Infinity Blade, the player character travels a mostly linear path through a ruined castle and fights one-on-one battles with oversized enemies.

An experience point system levels up the player character and their equipment (weapons, armor, shields, helms, and magic rings).

[6] The game follows a cyclical narrative structure in which the protagonist and his descendants individually explore a castle in a quest to battle the primary antagonist, the immortal God King.

[5] Another bloodline ending is unlocked after purchasing the Infinity Blade item: the sword is placed into a pedestal in the castle's underground dungeons and three doors open.

Upon defeating the mechanized warrior, the chamber is revealed to be controlled by an ancestor of the player character, who chose to serve the God King.

[2] After fighting the ancestor, the player character is told that the Infinity Blade can prevent immortals like the God King from resurrecting after death.

[6] The second update, titled Infinity Blade: The Deathless Kings, was released on March 2, 2011, and added the dungeons as a second branch to the game's path.

[10] On October 4, 2011, a fourth update added a new enemy and new equipment to coincide with the announcement of the forthcoming sequel Infinity Blade II.

Geremy Mustard, Chair's co-founder and technical director, estimates that the team cut two-thirds of that initial design due to lack of time.

[16] In addition to Geremy Mustard, the team was composed of Chair co-founder and creative director Donald Mustard; Simon Hurley as producer; Joshua Andersen and Scott K. Bowen as programmers; Adam Ford as art director; Orlando Barrowes, Bert Lewis, Mike Low, Scott Stoddard, and Nathan Trewartha as artists and animators; Joshua Akers as composer; and Brandon Raul Campos as lead tester.

[18] Chair sought to develop an experience that could be picked up and played for a minute (a single battle) or half an hour (a bloodline).

[18] Chair showed their playable demo at the Apple conference on September 1, 2010, after weeks of rehearsal, and attracted much attention to the game.

Chair felt that releasing several large, free updates to the game would increase their overall user base and result in more total sales due to word of mouth.

[18] Infinity Blade was noted for its sales at launch, selling more than 270,000 copies and making over US$1.6 million in its first four days—the "fastest-grossing app" ever released for iOS at the time.

IGN reviewer Hilary Goldstein said that it was "an absolute stunner for any handheld device and ushers in a new era of possibility for high-end graphics.

1UP.com's Matt Clark said that the sword gameplay "just feels right", while Mark Brown of Eurogamer said that the combat had an excitement factor that pushed players to keep on going for one more battle.

[29] Most reviewers found themselves between the two extremes, with Brown of Eurogamer simultaneously describing it as "alarmingly repetitious" but still addictive and 1UP.com's Clark saying that enjoying the game required getting past the repetition, despite being "stellar".

[31] A sequel to the iOS game, Infinity Blade II, was announced on October 4, 2011, during the Apple iPhone 4S keynote presentation.

[34] A novella by author Brandon Sanderson was released before both Infinity Blade II and III to serve as a story bridge between the games.

In it, Siris and the God King escape from their imprisonment by the Worker of Secrets, while extensive flashbacks show the rise of the Deathless in a future-Earth analog.

[37] A day after Epic Games removed the Infinity Blade trilogy from the App Store, the titular weapon made a crossover appearance in the winter-themed seventh season of Fortnite Battle Royale as a unique, very powerful melee weapon that can be obtained in a match, granting any player who finds it devastating abilities and extra survivability, at the cost of being unable to use other items.

[39] Epic Games later brought back the Infinity Blade in February 2019 as a restricted item that is only available in the limited-time mode "Sword Fight", reducing its power and allowing multiple copies of it to be found from loot chests.