Enter the main floor—open and airy, colorful and vibrant, with 40-foot ceilings, Red Rubino glass chandeliers, and a dazzling array of classic and state-of-the-art slot machines for every player, at every level. A new opening date. Walkers can reach it from the Orange Line MBTA Sullivan Station stop. The casino at Encore Boston Harbor brings glamour on a grand scale to the Mystic riverfront. Casinos in the commonwealth are set to open for gaming in phase three of the state's reopening plan, which could start July 6 … About Encore Boston Harbor Encore Boston Harbor features 210,000 square-feet of gaming space including more than 3,000 slot machines and 240 table games. Enter the main floor—open and airy, colorful and vibrant, with 40-foot ceilings, Red Rubino glass chandeliers, and a dazzling array of classic and state-of-the-art slot machines for every player, at every level.