Halo: Reach Custom Games Without Xbox Live Gold — Local Network Only

Yes, but strictly limited to Local Area Network (LAN) / System Link.

What Works Without Gold

• System Link: Connect two+ Xbox 360s (or Xbox One/Series via backward compat) via Ethernet switch/router without internet.
• Same Console Split-Screen: 2–4 players locally.
• Custom Game Options: Full map/gametype/modifier control in LAN lobby.

What Requires Gold (Xbox Game Pass Core)

• Xbox Live Matchmaking: Public custom game browser, "Find Party," "Find Game."
• Inviting Online Friends: Even to a private custom lobby.
• Downloading Maps/Modes from File Share: Requires Live connection.
• Voice Chat via Xbox Live Party: Use Discord/phone call instead on LAN.

Setup for LAN Custom Games

1. Connect consoles to same router/switch (Ethernet preferred).
2. On each console: Settings → Network → Test Network Connection → Confirm "Connected" (no internet needed).
3. Host: Multiplayer → Custom Games → Create Game → Set to "System Link" / "LAN".
4. Others: Multiplayer → Custom Games → Join System Link Game.

Note: On MCC (PC/Xbox One/Series), "LAN" is replaced by "Local Network" in Custom Game browser—same principle, no Gold needed for direct LAN play.