Fire Emblem Heroes (Japanese: ファイアーエムブレム ヒーローズ, Hepburn: Faiā Emuburemu Hīrōzu) is a free-to-play tactical role-playing game developed by Intelligent Systems and published by Nintendo for Android and iOS.

[1] Unlike other Fire Emblem titles, there is no element of randomness or chance in battles; an engagement between two characters is perfectly deterministic, as is the enemy AI, so a given strategy will either win or lose consistently.

Fire Emblem Heroes has a set of "story" missions divided by chapters for the player to complete, rotating challenge missions, a training tower for increasing character's strength in random battles, fights against other players' teams (albeit controlled by the game's AI) in the "Arena" and in "Aether Raids", special challenges involving "Brigades" where teams with eight or more characters are controlled on a larger map than usual, and a variety of other content to complete.

[5] In November 2017, the game released "Book II", which included a new animated video, new story missions, added new mechanics, increased the power of some of the weapons and skills perceived as weak, and introduced a new set of Heroes-exclusive allies and villains.

The protagonist, also known as the summoner,[7] whose name can be chosen by the player,[b] aids the Kingdom of Askr and its Order of Heroes, whose members include its Commander Anna, Prince Alfonse, and Princess Sharena.

In Book VIII (2023–2024), Askr and Embla struggle to protect their newfound peace from hostile attacks by a group called the Healing Hands, who inhabit Yggdrasil, the world tree that connects the realms.

The setting of Heroes includes loose references to Norse mythology; the names of the warring countries are that of Ask and Embla, the first humans, while the kingdoms introduced in later books match that of Niflheim, Muspelheim, and Hel.

Place names and spell descriptions often include fragments in the Old Norse language, such as rauðr, blár, and gronn for red, blue, and green.

The setting for Book IX draws inspiration from Asgard, and features reimaginations of Odin, Thor, Baldr, and Höðr in addition to Loki.

Immediately afterwards, Nintendo launched an online "choose your legend" promotion, in which players could vote for various characters from the series to be included in the game.

[1][15] As was the case with Nintendo's previously released mobile game Super Mario Run, Fire Emblem Heroes requires players to have an internet connection to play.

[16] One critic praised the game's casual-friendly design with its straightforward combat and character collection, but did not like the arbitrary play time constraint that stamina limit creates.

[36] Commentators have noted that despite having an install base smaller than Super Mario Run, Fire Emblem Heroes is more financially lucrative for Nintendo.

[37] The Verge noted this was due both to being a "superior game" to Super Mario Run as well as Heroes targeting a somewhat older audience willing and capable of paying microtransactions for more content.