1 MGM National Harbor ; 2 Horseshoe Casino ; 3 Live! Casino and Hotel ; 4 Ocean Downs ; 5 Rocky Gap Casino Resort. Anyone who opts for casino voluntary exclusion will be excluded from entering any Maryland casino, as well as cashing checks and using credit cards in the. Ocean Downs Casino: Open 8AM - 2AM, days a year, 7 days a week! Ocean Downs Casino, just 10 minutes from Ocean City, Maryland, has over slot. You must. Please play. · Must be present to win. Disclaimer: Maryland law requires an individual to be 21 years of age or older in order to enter the gaming floor or play video lottery terminals. · Prizes are non-transferable. . As one of the nation's top-awarded casinos, Rocky Gap Casino, Resort & Golf offers multiple award-winning dining, casino, spa, hotel, and bars in Maryland. · Must be 21 years of age or older to participate. Book your stay now for the ultimate gaming. Visit the top casino in National Harbor. We reserve the right to verify identification and age of all guests. General Rules · No purchase is necessary. · Drawings will. Enjoy table games, slots, and more at MGM National Harbor casino. Maryland Law dictates that all casino guests must be 21 years of age to enter.