Designing an arcade machine for sandbox games requires a careful balance of hardware, software, and user experience. Here are the key factors to consider:

1. Player Interaction: Sandbox games thrive on creativity and freedom. The arcade machine must feature intuitive controls, such as joysticks, buttons, or touchscreens, to allow seamless interaction.

2. Hardware Durability: Arcade machines endure heavy use. High-quality materials and robust components ensure longevity, especially in public spaces like arcades or gaming centers.

3. Immersive Experience: Vibrant displays, surround sound, and haptic feedback enhance immersion, making the sandbox world feel alive.

4. Customization Options: Sandbox games often involve user-generated content. The machine should support easy updates and mods to keep the experience fresh.

5. Multiplayer Capabilities: Many sandbox games are social. Incorporating multiplayer modes with split-screen or online connectivity broadens appeal.

By focusing on these elements, designers can create an arcade machine that delivers the open-ended fun sandbox games are known for.