To enter a casino, guests must present acceptable forms of identification to verify their age and identity. Commonly accepted IDs include government-issued photo IDs such as a driver's license, passport, or state ID card. Some casinos may also accept military IDs or tribal identification. It's essential to ensure that the ID is current and not expired. Additionally, some establishments may have specific requirements, so it's advisable to check the casino's policy beforehand to ensure a smooth entry experience.