I need to know which game you're asking about. "4-player campaign" works differently (or not at all) in every title.
| Game / Series | 4P Campaign? | How |
|---|---|---|
| Halo: MCC / 3 / Reach / 4 | ✅ (Co-op) | 4 players online/split-screen (2 per console on 360/One). Fireteam size 4. |
| Gears of War 1–3 | ✅ (Co-op) | 2-player split-screen + 2 online = 4. Gears 4/5: 3-player. |
| Left 4 Dead 1/2 | ✅ (Co-op) | 4 survivors, online or LAN. Versus = 4v4. |
| Borderlands 1/2/3 | ✅ (Co-op) | 4 players online. Split-screen 2P (console). |
| Diablo III (Console) | ✅ (Co-op) | 4-player local (couch) or online. |
| Monster Hunter World / Rise | ✅ (Quest) | 4-player hub → quest. Not "campaign" per se. |
| Deep Rock Galactic | ✅ (Missions) | 4 dwarves, drop-in/out. |
| Call of Duty (MW2/3, BO1-3, WWII, Vanguard) | ❌ | Campaign = 1P or 2P split-screen only. No 4P. |
| Destiny 2 | ❌ (Campaign) | Story = 1P (fireteam 3 in strikes/raids). |
| Star Wars Battlefront II (2005/2017) | ❌ | Campaign = 1P. Instant Action = bots. |
| Minecraft | ✅ (Survival) | 4P split-screen (console) / Realms / Server. |
| Terraria | ✅ | 4P+ (PC 8, Console 4). |
With that, I'll give exact steps: menu navigation, lobby settings, split-screen activation, subscription requirements (NSO, PS Plus, Gold/Core).