Deemo: Reborn

The core gameplay of Deemo is a score-based music video game. Each playable song features three main levels, namely Easy, Normal, Hard, each given a difficulty rating measured in a 'Level' scale. 0 version, marks the extension of the levels range, now being ranged from 1 to 12. A few selected songs also have an unlockable "Expert" difficulty which may have letters in place of the level number.

5 (fastest). Songs can also be "autoplayed" (in the Chart Mode), which plays the song automatically but disqualifies any scores and limiting tree growth.

The game's plot centers around a little girl named Alice who falls from an open trapdoor in the sky and a mysterious black being named Deemo, who, to help the girl return to her own world, plays piano music so that a special tree sapling sprouting from the piano will grow. As the tree grows, various rooms of the structure open for Alice to explore. She also encounters a person wearing a white gown and mask, referred to as the "Masked Lady", who expresses annoyance towards Deemo and the girl trying to grow the tree.

When the tree stops growing at a height of 20 meters, Alice discovers a stairway through a painting in the side room and walks into it with Deemo. The stairway leads to a chamber with another piano covered in thick thorns. As Deemo plays that piano, large-scale tremors occur and the tree resumes growth.

Rayark claims that Deemo saw 200,000 downloads within one month of release, and 7 million downloads as of October 2014, ranking first in the music game genre in the App Store of over 100 regions. At the time of the anime adaption's announcement in 2021, 28 million downloads of the original game were reported.

Deemo received generally positive critical reviews. Smartphone game review site TouchArcade gave a 4.5-star rating, citing "the game's art style and subtle story meld together beautifully to create an overall presentation that simply works". A Kotaku review praises the story delivering spectrum of emotions while accompanied by a fitting soundtrack, akin to "the rhythm game equivalent of musical theater". Last Recital for PlayStation Vita received a 33/40 Famitsu Score (8/8/9/8).