Arcade machines have evolved significantly to support networked multiplayer modes, requiring precise game state synchronization to ensure fair and seamless gameplay. Here’s how they achieve it:

1. Client-Server Architecture: Most modern arcade machines use a client-server model, where the server acts as the authoritative source for game state. Players' inputs are sent to the server, which processes them and broadcasts updates to all connected machines, ensuring consistency.

2. Lockstep Synchronization: Some arcade games employ lockstep synchronization, where each machine processes inputs in the same order. This method ensures deterministic outcomes but requires low latency to avoid lag.

3. Rollback Netcode: Advanced systems use rollback netcode to predict player inputs and correct discrepancies retroactively. This minimizes perceived lag, crucial for fast-paced arcade games.

4. Frame-Based Updates: Games often synchronize on a per-frame basis, with each machine updating its state at the same time. This keeps gameplay smooth but demands stable network conditions.

5. Local vs. Online Hybrids: Some arcade cabinets combine local multiplayer with online features, using hybrid synchronization to balance responsiveness and connectivity.

By leveraging these techniques, arcade machines deliver immersive multiplayer experiences, maintaining fairness and fun in competitive settings.