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Box art for System Shock 2
MODOFFICIALMod / Official mode · 1999 · Dark Engine

System Shock 2

2 projects let you play System Shock 2 together. Here's how they compare, and which one to start with.

A
Recommended

SS2Tool multiplayer toggle (original co-op)

Rated A (Complete), above 25th Anniversary Remaster (official co-op) at B. It has story co-op.

Website ↗

Every project, side by side

Recommended

SS2Tool multiplayer toggle (original co-op)

A
CompletePlay the story start to finish together, or a stable official co-op mode.
Kind
MOD Mod
Stage
Playable
Co-op
91%
Synced
  • See each otherUnknown
  • StorySynced
  • EnemiesUnknown
  • WorldUnknown
  • ItemsUnknown
Players say
Rate it and vote on its co-op %
Connect
Direct IP
Players
3
Tested
Player reports
Features
Story co-opPlayer reports
Latest release
No release yet
Last activity
Unknown
GitHub stars
-
About this project

The 1999 game ships a built-in co-op mode that SS2Tool unlocks via a Game features checkbox. Difficulty is locked to hard, and fan netcode fixes exist (ss2_netfixes, Dan's Multiplayer Gameplay Tweaks) but netcode is hard to improve without source.

What you need

Your own copy of System Shock 2.

Sources
Project page ↗Suggest a correction

25th Anniversary Remaster (official co-op)

B
PlayableYou can play together, with known gaps in what syncs or a rough setup.
Kind
OFFICIAL Official mode
Stage
Playable
Co-op
90%
Synced
  • See each otherUnknown
  • StoryUnknown
  • EnemiesUnknown
  • WorldUnknown
  • ItemsUnknown
Players say
Rate it and vote on its co-op %
Connect
Not stated
Players
4
Tested
Not checked
Features
-
Latest release
No release yet
Last activity
Stalled Jun 1, 2025
GitHub stars
-
About this project

Nightdive's June 2025 remaster advertises 4-player co-op with PC and console cross-play. A Steam thread says one store page dropped co-op wording and a PartyDeck issue claims LAN co-op, so confirm in-game.

What you need

Your own copy of System Shock 2.

Sources
Project page ↗Suggest a correction

Know another co-op mod for System Shock 2? Submit it.