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Nightmare Sphere (AKA: ナイトメアスフィア) is a free Castlevania-like and metroidvania-style doujin, indie game developed by 暁音♪ (AKA: n_sphere2, MickmanX, who used to be an art designer at Capcom) from Japan in 2009, using GameMaker Studio. It incorporates elements from classic 2D action video games like Metroid, Castlevania, Mega Man, and includes some degree of adult content.