Arcade game machines that feature age-restricted content, such as violent or gambling-themed games, employ various methods to ensure player authentication and compliance with legal regulations. Here’s how they typically handle it:

1. ID Card Scanners: Some modern arcade machines integrate ID card scanners to verify a player’s age before granting access. These scanners check government-issued IDs to confirm the player meets the minimum age requirement.

2. Operator Supervision: In many arcades, staff members manually verify a player’s age before allowing them to use restricted machines. This is common in locations where automated systems aren’t available.

3. Token or Membership Systems: Certain arcades require players to register for a membership card linked to their age. The card must be scanned before playing restricted games.

4. Remote Authentication: Some machines connect to centralized systems where age verification is processed through an online database, ensuring real-time compliance.

5. Physical Barriers: In some cases, restricted machines are placed in designated areas accessible only after age verification by an attendant.

These methods help arcade operators adhere to local laws while maintaining a fun and responsible gaming environment. Compliance varies by region, but the goal is always to prevent underage access to inappropriate content.