Sumerian Six is a 2024 stealth-based real-time tactics video game developed by Artificer and published by Devolver Digital.

Players must infiltrate a Nazi castle and stop a scientist from using a doomsday weapon during World War II.

During the interwar period, a group of scientists discover a powerful substance, Geistoff, but one of their members, Hans Kammler, betrays them.

Players must avoid detection by enemies, including cones that indicate line of sight; use the environment for cover; and hide corpses.

They found the start rocky, mostly with regard to what they felt was boring dialogue, but said that the tactical aspects were very fun, especially when levels afforded players creative freedom.