Theatrhythm Dragon Quest[a] is a 2015 rhythm game developed by indieszero and published by Square Enix for the Nintendo 3DS in Japan.

Reviews praised its gameplay mechanics, incorporating of series signature elements, and its aesthetic design, but criticized it for lacking original version soundtracks and featuring a limited song library.

The note charts are displayed on the top screen of the Nintendo 3DS, with players controlling the game using either the lower touchscreen or a combination of any button and the circle Pad.

[4] FMS primarily includes relaxed field songs with backgrounds depicting the characters' adventures, which are similar to those in Theatrhythm Final Fantasy.

In addition to the normal gameplay, Theatrhythm Dragon Quest introduced the Simple mode, where slides are replaced with tap.

[15] Additional tracks were released as free downloadable content via the Nintendo eShop, including some soundtracks from original Family Computer (NES) games.

[16][17] Producer Ichirō Hazama mentioned in an interview that developers would monitor fan feedback as to what additional songs would be included as downloadable content (DLC).

[27] Players who pre-ordered the game could download the Nintendo 3DS theme "Dragon Quest Music Band", which features chibi-style characters and monsters from the series.

Additionally, the console will play the music "Love Song Sagashite" from Dragon Quest II when waking from sleep mode.

Reviews applauded the title was suitable for a wide range of players, as it includes three difficulty levels, the option to switch freely between touch and button control schemes, and the Simple Mode for beginners.

[31][4] Reviews found that selected songs evoked a sense of nostalgia and provided a feeling of exhilaration, yet the music library was limited in size.

[31][30][1] Destructoid writer Joel Peterson applauded the music composed by Sugiyama and stated that it "is so beautiful, timeless, and memorable".

[3] However, the base game's track library, which mainly featured arranged music rather than classic 8- or 16-bit soundtracks, was criticized for lacking nostalgia.

[31][4] Hidetaka Nagayoshi from Inside commented that while the timbre of arrangements is beautiful, the different atmosphere from the original song made it uneasy for fans of Dragon Quest.