MercurySteam

José Ignacio Navas Dave Cox

Mercury Steam Entertainment S.L., doing business as MercurySteam, is a Spanish video game developer based in San Sebastián de los Reyes, Madrid. It was founded by former members of Rebel Act Studios, who had developed Severance: Blade of Darkness in 2001. Dave Cox, a producer at Konami, assisted MercurySteam during the Castlevania: Lords of Shadow trilogy.

After MercurySteam pitched a remake of the 2002 game Metroid Fusion to Nintendo, the producer, Yoshio Sakamoto, hired them to create a remake of Metroid II instead. MercurySteam collaborated with Nintendo again to develop a new game, Metroid Dread, for the Nintendo Switch. In December 2020, Nordisk Film, under their Nordisk Games division, purchased a 40% stake in the studio.

In October 2021, the company came under fire for excluding staff members from the credits of Metroid Dread. A representative defended the decision to GameSpot, stating "We accredit all those who certify a minimum participation in a particular project—usually the vast majority of devs. We set the minimum at 25% of development time." In October 2025, 3DJuegos reported that current and former employees of MercurySteam experienced a toxic work environment during the development of Blades of Fire, especially in early to mid-2025. These include forced 10-hour workdays and intimidation strategies.