Best campaign co-op games

A solo RPG that can become a shared sandbox adventure with co-op mods.

Solo by default. Co-op is modded, setup-heavy, and best with a small committed group.

Skyrim Together Reborn is widely documented as an 8-player co-op option, but quest and mod compatibility still need planning.

Source: Skyrim Together Reborn

A colony story generator that becomes a shared chaos machine with multiplayer mods.

Solo by default. Multiplayer requires community mods, matching mod lists, and a patient host.

RimWorld Multiplayer says any player count is possible but recommends a maximum of 8. Best treated as a long-running modded campaign.

Source: RimWorld Multiplayer

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.

A classic solo-first Souls journey that can become a more continuous co-op run through Seamless Co-op.

Native co-op is limited by summoning and boss boundaries. The mod is a better fit for planned friend playthroughs.

The Dark Souls Remastered Seamless Co-op mod is reported as synchronising progress and supporting up to six players total.

Source: Seamless Co-op

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.

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

A single-player mech campaign that becomes a squad mission night through the Armored Core Coop Mod.

The base campaign has no co-op. This is unofficial and best for PC groups comfortable with separate launchers.

Armored Core Coop Mod adds unofficial online co-op and community reports describe up to 6 players with enemy scaling.

Source: Armored Core Coop Mod