Deemo is a rhythm game developed by Rayark Games, an independent game developer in Taiwan. The levels were originally being ranged between 1 and 10, however the introduction of the Level 11 song Myosotis in the 2.0 version marks the extension of the levels range, now being ranged from 1 to 11. The player must tap on the notes when they reach the bottom line in time with the music, resembling playing on a piano. At the end of each level, the game shows the player's overall performance in a result screen, providing the proportion of "Charming" hits, the longest chain of consecutive successful hits , and the overall accuracy in percentage form, with 100% denoting all hits are "Charming". Notable contributors include Earthbound Papas and guitarist Shinichi Kobayashi. The game's plot centers around an unnamed little girl that fell from an open trapdoor in the sky, and a black, mysterious character Deemo who, to help the girl return to her own world, plays piano music to grow a special tree sapling sprouting from the piano. As the tree grows, various rooms of the structure open for the girl to explore.
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