Arcade machines, both classic and modern, incorporate various anti-tampering mechanisms to protect their internal components, revenue, and software integrity. These security measures are designed to deter both casual interference and serious attempts at cheating or theft. The most common protections include physical, electronic, and operational systems.

A primary line of defense is physical security. This typically involves robust locking systems on the coin door and the main cabinet. These high-security locks are often pick-resistant and require specialized keys, preventing unauthorized access to the cash box and internal electronics. Additionally, many cabinets use tamper-evident seals or security screws that show clear signs of forced entry. The cabinet itself is often constructed from heavy, durable materials designed to resist prying or forced opening.

Beyond the locks, electronic anti-tampering is crucial. For coin-operated systems, a secure coin mech or validator is installed to prevent slug use and credit hacking. Internally, the Printed Circuit Board (PCB) is frequently protected by security screws and may be housed in a locked metal cage. Modern systems might also employ software-based checksums or encryption to detect and prevent unauthorized ROM modifications or firmware hacks, which could enable free plays or cheat modes.

Environmental and monitoring systems also play a role. Some machines have tilt sensors or mercury switches that trigger a alarm or freeze the game if the cabinet is moved or shaken excessively—a common tactic to manipulate older games. Furthermore, audit counters and built-in logging software track credits, coins, and game resets, allowing operators to identify suspicious activity during routine maintenance.

Together, these layered mechanisms—physical barriers, electronic safeguards, and operational monitoring—form a comprehensive strategy to ensure arcade machines remain secure and profitable for their operators.