3 Layers Every Online Multiplayer Game Runs On

0:00 Intro 0:17 The 3 Layers of Multiplayer Tech 4:56 Photon’s Products Across the Stack 6:54 Transport Layers & Steam Relay Limitations 8:02 Fusion vs Quantum + Designing for the Envelope 10:36 Start from the Top: When Transport‑Only Makes Sense (MMOs, Server Logic) 15:53 From PUN to Modern Netcode + Notable Games 21:21 State Replication vs Determinism Explained 24:49 Why Shooters Prefer Client‑Server (Lag Comp, Interest Mgmt) 26:11 Server Build, Shared Mode, and Architecture Clarified 28:04 Anti‑Cheat in Quantum: Replays, Spectators, Server Sim 31:49 Grow Gradually: From Zero Servers to Full Validation 34:38 Under the Hood: Predict‑Rollback, Physics, ECS, AI 38:32 No Ring Buffer: Constant‑Time Rollbacks 45:28 Testing Online, Tooling, and Community 46:15 When to Use Fusion Instead of Quantum 50:29 Performance: Verified vs Predicted, Clamps & Culling 52:34 Bots, Matchmaking Math, and AI Costs 56:49 AI Design: Verified‑Only Planning + Operational Prediction 58:02 Verified‑Only Code Paths & Performance Targets 1:01:48 Time Slicing AI for Stability 1:02:52 RTS in Quantum: Flow Fields, Culling, and Use Cases 1:09:19 Lockstep vs Prediction: Why He Avoids Lockstep 1:12:04 Handling Rollback Spikes with Scheduling Tricks 1:13:05 Auto‑Battlers: Verified‑Only + Snapshot Interpolation 1:15:29 Hidden Info & Simultaneous Decisions; Server‑Gated Commands 1:21:35 Using Quantum Offline? Licensing & Terms 1:25:03 Determinism, ECS, and Quantum’s Hybrid Tables 1:29:22 Could There Be a Deterministic Engine Built on Quantum? 1:31:08 Cross‑Engine Experiments & Engine Integrations 1:35:42 Open Worlds: Fusion Player‑Hosted vs Quantum 1:37:10 Quantum for Open Worlds: Voxels, Persistence, NavMesh, Procgen 1:46:08 Where Engines Stand on Multiplayer (Unreal, Unity, Source) 1:51:32 Pricing: Free 100 CCU and Scaling Costs 1:54:45 Long‑Tail Costs & Keeping Servers Alive 1:57:40 Game Preservation: LAN, Offline, and Local Servers 2:04:48 What’s New: Fusion 2.1, Quantum 3.1, Unreal Betas 2:05:55 First Multiplayer? Start Small and Prototype 2:08:12 Prototyping: Quantum vs Fusion (Shared Mode) 2:10:30 From Prototype to Production: Managing Complexity 2:14:11 What Makes a Multiplayer Hit? Trends vs Design 2:16:29 Fusion’s New Physics Forecasting 2:17:47 Riding vs Making Trends (Landfall’s Streak) 2:21:02 Dogfooding: Prototyping to Improve the Tools 2:24:26 Closing & Thanks