The grand opening still requires approval by the Maryland Lottery, which will oversee a trial run to take place before June 6.
So far, two Maryland casinos are open — one in Cecil County and the other on the Eastern Shore.
The state's largest casino, at Arundel Mills mall in Anne Arundel County, will initially open with 3,200 slot machines. The remaining phase of the facility is due to come online by the fall, said Joe Weinberg, managing partner of The Cordish Cos., the Baltimore developer that owns the casino. When complete, the casino will operate 4,750 machines.
"It feels great," Weinberg said. "This is why we do it: to open and provide this gaming, dining and entertainment experience to the region."
On Thursday, Maryland Live! also launched a free online "play for fun" casino at Myliveonlinecasino.com, which officials said was the first of its kind in the gaming industry.
Gamblers can log on and play slots games — some of which will be available at the bricks-and-mortar facility — and win virtual credits as well as sign up for a casino rewards card.
The online games are not played for money.