Saints Row 3 Online Multiplayer: None — Single-Player Only

Saints Row: The Third (2011) has no online multiplayer.

Multiplayer Reality

• Co-op Campaign: 2-player drop-in/drop-out (online or LAN) — full story playable together.
• Whored Mode: 2-player survival horde (DLC / included in Full Package).
• No competitive/versus modes. No matchmaking, no PvP, no >2 players.

Sequels Added Multiplayer

• Saints Row IV (2013): Same 2-player co-op + Whored Mode.
• Saints Row (2022 Reboot): 2-player co-op only.
• Agents of Mayhem (2017): Single-player only (spinoff).

For 3+ player open-world chaos: GTA Online, Red Dead Online, Just Cause 2/3/4 MP mods (PC), Crackdown 3.