More than 4?

A single-player open-world chaos sandbox with a historic multiplayer mod built for huge servers.

Solo by default. The multiplayer mod is famous but much quieter now, so check server activity first.

The Steam page describes extending Just Cause 2 to dozens, hundreds, or thousands of players; current population may be low.

Source: Just Cause 2 Multiplayer Mod

Readable, casual online multiplayer that can carry a full Discord call.

A solo open-world destruction sandbox with community multiplayer modes for freeroam, racing, and roleplay.

Solo by default. JC3 multiplayer exists, but server health varies and may be quiet.

JC3MP opens the game to community servers and custom game modes such as racing, deathmatch, roleplay, and freeroam.

Source: JC3MP

A single-player space-program sandbox that can become a shared universe through Luna Multiplayer or DarkMultiPlayer.

Solo by default. Multiplayer depends on a server and agreement around time warp.

Luna Multiplayer and DarkMultiPlayer provide shared-universe server play, including time-sync/warp handling.

Source: Luna Multiplayer

Submarine disaster management for groups who enjoy jobs, shouting, and betrayal.

Local or online physics brawling that gets sillier as people rotate in.

Brutal social survival for groups who specifically want a server war story.

Not cosy co-op. Works for 16+ only if the group wants PvP survival friction.

Phone-controlled party games for mixed groups.

Scrappy physics horror extraction for groups who enjoy panic, betrayal, and bad decisions.

Native lobbies are capped at 6. Larger rooms depend on community mods and can be less stable.

Community lobby-size mods can push past the native cap; treat this as best-effort rather than guaranteed support.

Source: community lobby-size mods

Creature survival chaos that can scale up when hosted properly.

Large groups require a dedicated server; small co-op is simpler.

Underground survival crafting that scales nicely beyond a small squad.

A cooperative walker-talker from House House built around getting lost and communicating with friends.

Planned for August 4, 2026; use as a wishlist/upcoming pick until release.

Persistent war logistics for groups that want a shared long-term campaign.

Best when the group joins the same faction and treats it as an ongoing campaign.

Survival exploration that turns into a shared expedition through co-op mod setups.

Solo by default. Co-op requires mod setup and can have progression or sync rough edges.

Nitrox advertises large-event support up to 100 slots, but normal friend groups should expect a smoother experience at much smaller counts.

Source: Nitrox

Private lobbies and custom servers for groups that want teams, aim, or chaos modes.

Best for 10+ as private teams or community/custom server modes.

Chaotic elimination rounds for very large, unserious groups.

Social deduction with lots of roles and room for a large voice call.

An effectively endless shared MMO journey with group bosses, raids, skilling, and years of account progression.

Individual activities have practical group caps, but the overall game and clan structure support very large communities.

Large-team class shooter with a massive history of silly server nights.

Lightweight zombie survival with private-server flexibility.

Best for 16+ with a private server and agreed mods/settings.

Social worlds, party games, murder mystery rooms, and hangouts for very large groups.

Works without VR; choose private/group instances for friend nights.

Social deduction that scales well beyond the usual four.

Simple cooperative puzzles that get funnier as communication breaks down.

A viral paint-and-hide party game with chaotic lobbies and strong spectator energy.

Recommended around 2-10 players; larger rooms depend heavily on host connection and stability.

Prop Hunt, Trouble in Terrorist Town, sandbox chaos: still a big-group toolbox.

Requires choosing a mode/server; great once someone hosts.

Bosses, building, exploration, and long-term chaos for a medium group.

Lightning-fast 8-duck couch deathmatch where one shot ends a round.

Chill farming co-op that works for short visits or long campaigns.

Huge low-poly battlefield chaos if your group wants to pile into the same war.

Not private-party focused, but excellent for large groups joining together.

Physics brawling made for casual group nights.

A physics driving sandbox that becomes a casual group driving or racing server through BeamMP.

Single-player by default. BeamMP requires its launcher and server browsing outside the base game.

BeamMP is an active multiplayer mod with public servers and a large installed server ecosystem.

Source: BeamMP

Deep survival sandbox for patient group storytelling.

Large groups are best on a dedicated server with agreed rules.

Survival crafting with broad group goals and low pressure pacing.

Best for larger groups with a persistent hosted world.

A civilization-scale server game about building society without destroying the planet.

Needs a persistent server and a group willing to coordinate over days.

Voxel survival RPG with a meaningful 16-player ceiling for hosted worlds.

Use a hosted or dedicated server for smooth 16-player sessions.

A shared factory project that gets funnier and more terrifying with each extra engineer.

Large groups work best with a persistent server and clear roles.

Dinosaur survival for groups who want a persistent server project.

16+ is a server-hosting commitment, not a casual lobby.

First-person factory building for a group that enjoys shared megaprojects.

Bigger groups are possible through server setups, but 4-8 is the clean recommendation.

Five more phone-controlled party games for a full room or a Discord call.

Free platform-fighter with deep local versus for a controller pile-up.

Free-to-play. 8 local is supported, though default PC controller drivers often work most reliably around 4.

Free explosive mini-game brawler that scales to a full living room of players.

Free. Not on Steam — download from the official BombSquad site; phones can also join as gamepads.

Turn-based artillery warfare made for passing one controller around the couch.

The default large-group sandbox: build, survive, mod, or host a private event.

16+ works best with a Realm or dedicated/community server.

Browser-based drawing telephone that works for huge casual groups.

Browser game; not a Steam import match, but excellent for big groups.

Fast browser drawing rounds for groups that need zero install friction.

Browser game; great backup when ownership is fragmented.