Arcade machines employ sophisticated mechanisms to combat counterfeit coins and token fraud, ensuring revenue protection for operators. Traditional coin-operated systems use magnetic properties, precise weight measurements, and optical scanning to verify genuine currency. Modern machines incorporate electromagnetic sensors that detect specific metal compositions, while microprocessors compare coins against stored valid parameters. Advanced systems utilize coin comparators with infrared light beams to analyze surface patterns and edges. Contemporary arcades have transitioned to token-based or digital payment systems featuring embedded security chips and encrypted data. Some establishments implement camera surveillance and centralized monitoring to track suspicious activity. These multi-layered verification processes immediately reject invalid currency through physical diverters or electronic locks. The continuous technological evolution in arcade security demonstrates the industry's commitment to maintaining operational integrity against fraudulent attempts.