castlevania:_harmony_of_dissonance
Castlevania: Harmony of Dissonance (キャッスルヴァニア 白夜の協奏曲, lit. Castlevania: Concerto of Midnight Sun) is a Castlevania (series) game released for Game Boy Advance by Konami on June 6, 2002.
A tool-assisted speedrun attracted a lot of attention on NicoNico that it became a meme.