From WiKirby, your independent source of Kirby knowledge.
"Dark Castle" is the stage theme of the Dark Castle stage in Kirby's Dream Land 2. It was later remixed for Kirby: Planet Robobot. The original song was composed by Tadashi Ikegami.
Kirby's Dream Land 2
This theme appeared here as the Dark Castle's background music.
Kirby's Dream Collection Special Edition
When selecting Kirby's Dream Land 2 in the "Kirby's History" mode, the Dark Castle theme plays.
Kirby: Planet Robobot
This theme appeared here for the background music in the third stage of Rhythm Route. This remix is titled Neon Laboratory, and was arranged by Hirokazu Ando. It can also be heard as Track 045 in the game's Jukebox.
Kirby's Dream Buffet
The original version from Kirby's Dream Land 2, named Kirby's Dream Land 2: Memorial Song 2 in-game, is unlocked for potential use in races and Free Rolling upon reaching Gourmet Rank 117. This game is the first to confirm that the theme was composed by Tadashi Ikegami.