Arcade machines, especially those in public spaces, are often targeted by tampering attempts, ranging from coin fraud to internal component theft. To combat these threats, manufacturers implement various anti-tampering mechanisms. Here are the most common types:

1. Physical Locks and Enclosures: Heavy-duty locks secure coin doors and access panels, preventing unauthorized entry. Some machines use tamper-resistant screws or custom keys.

2. Tamper-Evident Seals: These seals break or leave marks when removed, alerting operators to potential tampering with internal components like circuit boards.

3. Software Encryption and Authentication: Firmware and game software may include checksums or digital signatures to detect unauthorized modifications or bootleg software.

4. Coin Mechanism Protections: Anti-cheat devices in coin slots prevent fake coins or string-pulling tricks, ensuring only valid payments are registered.

5. Motion and Tilt Sensors: Some machines detect tilting or shaking, common in attempts to manipulate gameplay or dislodge coins.

These mechanisms help maintain arcade machine integrity, ensuring fair play and profitability for operators.