Symphony of the Seas is the second of two identical "Oasis 3" class cruise ships (the new “world’s largest” liners), together with its sister Harmony Of The Seas (launched in 2016). The Symphony ship exceeds in size the original Oasis-class vessels Oasis and Allure, and has building cost of USD 1,35 billion (2016 shiporder rates).
Most Symphony of the Seas staterooms are 180-270-sq.foot Balcony rooms (1772). There are a total of 2744 staterooms in 43 categories. 46 are the wheelchair accessible rooms. Among the largest cabins are Royal Loft Suites (142 m2).
The Ultimate Family Suite is an unique for RCI loft suite featuring a slide (from the kid’s bedroom down to the living room), floor-ceiling LEGO wall, hidden nooks for chilling, air-hockey table. A 3D movie theater-style TV room is fitted with popcorn machine and library of video games. The 210 ft2 wraparound balcony has a bumper pool table, kids climbers and full-size whirlpool. The largest and most-fun Family Suite at sea accommodates up to 8 passengers.