Just Cause™ 3: Multiplayer Mod

Open World· Action· Massively Multiplayer· Violent

Released Jul 2017

Just Cause 3 Multiplayer mod is a free fan-created project bringing an explosive and highly-customizable multiplayer.

77% positive · 2,714 reviews

Not yet

Released, but content still planned

High confidence

Content Planned

Not yet

Released, but content still planned

High confidence

Content Planned

Where to get it

Free on Steam

Steam Free

Evaluation

Just Cause 3: Multiplayer Mod is a free fan-made project that originally launched on Steam on July 20, 2017. After a long dormant period, the developer returned in May 2026 with update 1.0.7, fixing crashes on Windows 11 and Steam Deck, modernizing internal systems, and explicitly promising more development ahead — including a public roadmap. Just one month later, on August 19, 2026, the developer shipped update 1.0.8, replacing core parts of the multiplayer networking stack, restoring server features, and improving synchronization. The update post closes with "More is coming" and describes the update as laying the groundwork for future gameplay work. The developer is explicit that long-standing issues are not yet resolved and that the current updates are preparation for more substantial improvements still ahead. This is an actively developing project with the developer clearly engaged and publicly committed to further updates.

Evidence

Update 1.0.8 ships major networking and sync improvements, with the developer explicitly stating 'More is coming' and describing this update as laying the foundation for future gameplay work.

news post · Aug 19, 2026 source content planned

high

Update 1.0.7 returns the mod to active development after a long gap; developer states 'there are more updates on the horizon' and promises to share a public roadmap, with in-progress features from the original 1.1 update described as 'more immediate things coming.'

news post · May 2, 2026 source content planned

high

Media

Details

Developer

nanos GbR

Publisher

nanos GbR

Achievements

—

Platform

Windows

Controller

partial support

Steam Deck

Unsupported

Players

Multiplayer · PvP

Action Massively Multiplayer Open World Violent Shooter Free to Play Third-Person Shooter Mod Third Person Sandbox Funny

About this game

Just Cause 3 Multiplayer mod is a free fan-created project bringing an explosive and highly-customizable multiplayer to the critically acclaimed action sandbox game. Get ready for countless hours of hilarious brawls, stunts and races with hundreds of other players!

For a more detailed list of the current options and instructions on how to install and play the mod, please see our FAQ on the Steam discussion board.

We at Nanos are an enthusiastic team of coders from Germany, Austria and the UK who have worked towards releasing Just Cause 3 Multiplayer for more than a year. Our goal is to bring multiplayer to the next level by allowing the players themselves to build upon our work!

KEY FEATURES:

Battle, race, chase and play tag with fighter jets with up to hundreds of players per server.
Enjoy community created gamemodes, ensuring a constantly evolving play set.
Countless hours of fun including racing, deathmatch, skydiving, freeroam, etc.
Don’t see the game mode you want? Make one!
State-of-the-art synchronisation helps reduce lag to a minimum.