ReLU Games is a studio under KRAFTON that develops AI-driven games, currently focused on the cooperative horror game MIMESIS, which has sold 2 million copies on Steam since early access began in October 2025 and won a CEDEC Award for game design.
ReLU Games, a studio under KRAFTON, has built its recent identity around AI as a core design language rather than a supporting tool. At a KRAFTON x ReLU Games talk event in Tokyo on August 5, 2026, ReLU staff detailed the three principles behind their studio workflow and the development of MIMESIS, a horror game that pits four players against an AI that mimics them. The game entered early access on Steam in October 2025 and has since sold 2 million copies.
MIMESIS has also earned critical recognition. It won the Excellence Award in the Game Design Division at the CEDEC Awards 2026, cited for its innovative use of AI that mimics players' voices and actions. The award, along with the sales milestone, shows that AI-driven game design can achieve both commercial success and critical acclaim in the cooperative horror genre.
The game's development has been iterative. A major update released on June 16, 2026, overhauled the AI monster's decision-making, added individual monster personalities, revised the progression from fixed 3-day cycles to a flexible structure, expanded dungeon interiors, and revamped the spectator system to let eliminated players possess monsters. The first major update, released in the month before the CEDEC announcement, boosted player numbers and sales. ReLU's approach, as presented at the Tokyo event, treats AI not as a tool but as a design language, with a prototype pipeline that produced 114 seeds and turned a shelved concept into a 2-million-seller.
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At a KRAFTON x ReLU Games talk event in Tokyo on August 5, ReLU staff detailed their AI game design approach, including the three principles behind their studio workflow and the development of the horror game MIMESIS. The game, which pits four players against an AI that mimics them, has sold 2 million copies on Steam since early access began in October 2025.
Cooperative horror game MIMESIS has sold over 2 million units worldwide since its early access release last October. The game also won the Excellence Award in the Game Design Division at the CEDEC Awards 2026, recognized for its innovative use of AI that mimics players' voices and actions. The first major update last month boosted player numbers and sales.
KRAFTON JAPAN released a major update for the co-op horror game Mimesis on June 16, 2026. The update improves the AI-driven monster's decision-making, adds individual monster personalities, revises the game's progression from fixed 3-day cycles to a flexible structure, expands dungeon interiors, and revamps the spectator system to let eliminated players possess monsters.