Arcade game machines that feature mature content, such as violent or suggestive themes, employ various methods to verify the age of players and comply with legal regulations. One common approach is the use of physical ID checks by arcade staff or operators, who may request government-issued identification like a driver's license to confirm a player is of legal age, typically 18 or older. Some machines are designed with built-in token or card systems that require age verification during purchase or registration, limiting access to pre-authorized users. Additionally, arcades often place these machines in restricted areas monitored by cameras or personnel to prevent underage access. In regions with strict enforcement, digital integrations like biometric scans or online age gates may be used, though these are less common due to cost and privacy concerns. Overall, the responsibility falls on arcade owners to implement and enforce these measures, ensuring adherence to local laws and protecting minors from inappropriate content.