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MercurySteam, also known as Mercury Steam Entertainment, is a video game development studio based in San Sebastián de los Reyes, Spain. Founded by veterans of Rebel Act Studios and Konami, MercurySteam is best known for the Lords of Shadow games in the Castlevania series.
Before working on Samus Returns, MercurySteam pitched a Metroid Fusion remake but Sakamoto while impressed rejected the pitch but enlisted their help in remaking Metroid II which would later become Samus Returns.