Big Ambitions Multiplayer — Co-op Status & Mod Options

No — Big Ambitions does not have multiplayer. There is no co-op, no competitive mode, and no shared city: the game is single-player only, and the developer has never announced official multiplayer on its roadmap, in Steam announcements, or anywhere else. The full 1.0 release in August 2026 did not change that. If you were hoping to run a business empire with a friend in the official game, the honest answer is that the feature does not exist.

What exists instead is a community project: Big Ambitions Online, an unofficial multiplayer mod built by a member of the game's community. It is a genuinely impressive piece of work, and it is also unofficial, unsupported and not risk-free. This page covers both halves — the official status, and what the mod can and cannot do — so you can decide with clear eyes.

The official position: single-player by design

Big Ambitions' entire architecture is built around one player living one life in New York City — your character's jobs, courses, businesses and schedules. Nothing in the systems, the UI or the save structure anticipates a second player, and Hovgaard Games has consistently spent its development capacity on single-player depth instead: factories, cinemas, blueprints, The Hamptons and the rest of the 1.0 release.

For players whose interest is "can my friend and I build competing empires in the same city", the closest official-adjacent answer is the business rivalry system, where the game itself spawns competitor businesses to outmaneuver — but those rivals are AI, not people. Anyone selling "official Big Ambitions multiplayer" is mistaken or lying; there is nothing to buy.

Big Ambitions Online: the unofficial mod

The community answer is Big Ambitions Online, an unofficial multiplayer mod developed by a community member and announced on the r/bigambitions subreddit, with updates coordinated through the post and the official Discord. It is the only multiplayer experience that exists for the game, and its development has been visible and public rather than a drive-by drop — which matters when you are evaluating whether to trust it with your saves.

What it provides is the ability to share the city with other players rather than a polished co-op campaign. Expect the rough edges that implies: it is a mod running on top of a single-player simulation, not a netcode product from a network engineering team. How closely it matches the current 1.0 build at any given moment is the practical question to check before installing — to be confirmed against the project's own announcements, since mod versions lag game versions as a rule.

The risks, stated plainly

The costs of trying it are real, and they are worth listing before you install anything. First, installation is not one-click: Big Ambitions Online uses MelonLoader, a loader injected into the game directory, which is a different and more invasive mechanism than Steam Workshop subscriptions. Second, every player in a session needs the same mod version, so your whole group moves together.

Third and most important: unofficial multiplayer mods put your saves at risk. Corruption and incompatibility are the standard failure modes for this class of mod, and the community's own guidance is to treat it as experimental. Back up your save folder before you touch any of it, and ideally test on a throwaway save rather than the empire you have spent eighty hours building. An unsupported mod also means no help from Hovgaard Games if something breaks — support starts and ends with the mod's developer.

What official multiplayer would actually require

It is worth understanding why "just add co-op" is harder for this game than for most, because it explains the developer's silence better than indifference does. Big Ambitions simulates every citizen, business and delivery in New York simultaneously; a shared city means synchronizing that entire simulation across machines, and a second player means either duplicating the economy (whose store is whose?) or redesigning ownership around two empires competing for the same sidewalks. That is a rebuild, not a feature.

The save format tells the same story: one character, one bank account, one set of business relationships. Every roadmap update so far — factories, banking, The Hamptons — deepened the single-player simulation rather than branching it. If official multiplayer ever arrives, it would be an announcement on the scale of a sequel, and it would appear on the roadmap long before it appeared in a patch; nothing of the sort is there today.

If multiplayer is a dealbreaker

If you were specifically after co-op tycoon gameplay, honesty is the kindest advice: Big Ambitions is not that game, and no roadmap item makes it that game. The single-player loop it offers — building stores, optimizing layouts, growing from one shop to an empire — is deep enough that many players stop asking about multiplayer somewhere around their third business, but that is a taste judgment, not a sales pitch.

For alternatives, our games like Big Ambitions list covers the neighboring business sims, some of which approach shared or competitive play differently. And if single-player Big Ambitions is on the table after all, the beginner guide is the fastest way to find out whether the empire side of the fantasy scratches the itch on its own.

Quick answers to the rest of the multiplayer questions

Can two players share one save? No — a save belongs to one character and one empire, and there is no hot-seat or handover mode. Can you trade between players? No, there is no player-to-player economy of any kind. Is Big Ambitions Online on Steam Workshop? No, it is a MelonLoader-based project distributed by its developer, which is why installation and version-matching matter so much. And is the developer angry about the mod? Quite the opposite in tone — the project has been announced and updated openly on the community's own channels, which is about as friendly as unofficial gets.

The bottom line

So: single-player today, an unofficial mod for the curious and the brave, and nothing official on the table. If that is a dealbreaker, our games like Big Ambitions page is the honest next stop. If it is not, the game's own answer to "what is there to do with friends" is the one every tycoon eventually gives — compare empires, argue about layouts, and try to beat each other's daily profit on a leaderboard made of screenshots.