Arcade machines have long been a target for fraudsters attempting to manipulate systems for free plays or credits. To combat this, manufacturers implement various anti-spoofing mechanisms. Here are the most common types:

1. Coin Validation Systems: Traditional arcade machines use mechanical or electronic coin validators to detect counterfeit coins or slugs. Advanced models employ weight, size, and magnetic properties to verify authenticity.

2. RFID and NFC Technology: Modern machines often integrate RFID (Radio-Frequency Identification) or NFC (Near Field Communication) to validate tokens or cards, preventing unauthorized access.

3. Software-Based Checks: Embedded software monitors gameplay patterns, flagging suspicious behavior like rapid button mashing or infinite credit exploits.

4. Tamper-Proof Hardware: Secure enclosures and anti-tampering mechanisms deter physical hacks, such as lockout switches or encrypted circuit boards.

5. Camera and Sensor Integration: Some high-end arcades use cameras or motion sensors to detect fraudulent activities, like tilting machines or inserting foreign objects.

These mechanisms ensure fair play, protect revenue, and maintain the integrity of arcade gaming. As technology evolves, so do the methods to outsmart would-be cheaters.