Designing an arcade machine for spectator engagement requires a blend of interactive gameplay, visual appeal, and social dynamics. First, the game mechanics should be easy to grasp but hard to master, allowing spectators to quickly understand the action while appreciating skilled play. Bright, dynamic visuals and LED lighting can draw attention in crowded spaces. Multiplayer or competitive modes encourage group participation, turning solo play into a shared experience. Additionally, incorporating leaderboards or live score displays fosters rivalry and excitement. Finally, ergonomic design ensures the machine is accessible and comfortable for both players and onlookers, creating an inclusive gaming environment. By balancing these elements, arcade machines can become hubs of entertainment and social interaction.