Vanilla Left 4 Dead 2 seats exactly four survivors in co-op. Every 2hours.gg L4D2 server ships with the mods that lift that cap.
How it works
- Pick a server size with enough seats when you deploy (8 or 20). The mods (L4DToolZ + MultiSlots) are already on; nothing to configure.
- Everyone connects normally. Land in spectator? Type
!joinin chat to take a survivor slot. That’s the trick most people miss. - One catch: joining through a Steam lobby (Community mode) caps co-op at 4 humans, no matter how many seats the server has. For 5 or more people, share the IP and everyone connects directly.
- Campaigns are balanced for 4, so a big group is chaos by design: the infected bots scale up to match. Start on Normal difficulty.