MAJJAM is a vibrant co-op adventure inspired by the communal creativity of a live jam session, where players can build their own expressive arsenal of melodies, rhythms, and harmonies to explore and rescue a vibrant and ever-evolving world. With music at its core, MAJJAM offers a deeply immersive social experience that celebrates the connective power of both video games and music.

In the lively world of MAJJAM, players interact with each other and their surroundings almost exclusively through rhythm and melodies. Music is the world’s life force — a sustaining energy that holds everything together and stands as the only defense against a corruptive presence known as Kodé: a dark and encroaching presence pushing fog tides where death and silence rule. Players harness musical energy by Jamming, combining the unique abilities of their character and instruments alongside their allies to defeat enemies, solve puzzles, and reshape the world around them.

The ability to Jam is the main expression of music in-game, giving all players the opportunity to become musicians. The studio’s mission is to make the world jam together, so no instrumental expertise is required to cast melodies and rhythms. Jamming serves multiple functions: fighting back against Kodé, exploring and influencing the environment, uncovering and solving puzzles, and more!

Each character’s special Jam ability is supported and augmented by a system of musical abilities that players will be able to unlock, collect, and store throughout the game. Each ability has a specific musical power that further deepens the player’s skill set and relationship to the world.

“Our team’s dream is to make the world jam together. In music, a jam is a suspended moment — a shared energy between friends, strangers, and other passionate souls who just happen to be there. You might not know each other, but for a few magical, spontaneous moments, you vibe together. It’s that same spark you sometimes feel in a multiplayer game. Our dream is to bring all these joyful moments together into one single, shared experience,” shared founders of Opus Major, Pierre-Armand Nicq and Jean-Nicolas Vernin.

Interested fans can register for a September 2025 playtest here!

Key Features:

• The Fun & Creativity of Jamming, for everyone: MAJJAM captures the joy and spontaneity of a musical jam session, for musicians and non musicians. The game’s technology auto-harmonizes all player performances online, with no noticeable latency. Players collaborate through intuitive gameplay mechanics, not musical skill, making creativity accessible to all. Majjam is not a rhythm game: it emphasizes communal creation as players express their characters’ musical abilities. 
• A Shifting, Musical World: The vibrant, detailed world of MAJJAM is constantly shifting based on player input: the environment is reacting to player abilities, responding to it, and even opening mysteries. By combining their musical expressions with others, players can reshape part of the world around them, unlocking new areas, discovering powerful melodies, and encountering surprising obstacles. 
• A Dynamic & Dangerous Fog System: Kodé isn’t just an antagonist—its power is materialized in the game as a massive environmental threat; a lethal active force that defines the boundaries of exploration. Players can beat back its fog through their musical powers, and explore new zones that used to be restrained under the fog tides. 
• Social Experiences with Personal Customization: Whether you enjoy strumming some chords, hearing delightful woodwind melodies or you’re percussion-addict, MAJJAM offers multiple, colourful character types for players to select, each with their own musical capabilities and distinct look. The key to maximizing their power comes from jamming with others, cooperatively creating with fellow players to craft a perfect harmony and exponentialize the effects on the world of Majjam.

MAJJAM is in development for PC (Steam).