Arcade machines have long been a target for fraud due to their coin-operated nature and high-traffic usage. To combat cheating and theft, manufacturers implement various anti-fraud mechanisms. Here are the most common types:

1. Coin Validation Systems: Modern arcade machines use electronic coin validators to detect counterfeit coins or slugs. These devices measure weight, size, and magnetic properties to ensure only legitimate currency is accepted.

2. Tamper-Proof Enclosures: Arcade cabinets are often built with reinforced locks and heavy-duty materials to prevent physical tampering. Some even include alarms triggered by unauthorized access.

3. Software Safeguards: Many machines feature encrypted software that logs unusual activity, such as repeated free plays or score manipulation, and may disable the machine if fraud is detected.

4. Bill Validators: For machines accepting paper currency, advanced bill validators scan for security features like watermarks and holograms to reject fake bills.

5. Time-Based Limits: Some arcades implement time-based restrictions to prevent players from exploiting free-play modes or lingering too long without paying.

These mechanisms help maintain fair play and profitability for arcade operators while ensuring a seamless experience for legitimate players.