Dorothy, Scarecrow, Tin Woodman and Cowardly Lion are playing Chinese Official Mahjong Competition Rules (MCR).
Julia is teaching Harry and Meghan to play American Mah Jongg. They kept a seat for Oprah, but she said she could only come tomorrow.
Furry Tan, Kan Maker, Queen of Souzu and Ura the Explorer are playing Riichi (Japanese Mahjong).
Goldilocks, Daddy, Mommy and Baby are playing Sichuan "Bloody" Rules (SBR).
Aunt Angelica, John Benedict, Mary Rose and Uncle Christian are playing Filipino Mahjong.