The initial round of tickets for the Cursed Kid as well as Harry Potter have sold out, with producers releasing another mountain, open to supporters who enrolled for priority booking.
The first four months of tickets, for performances from 7 June-18 September 2016, went on sale at 11:00 GMT, selling out in several hours.
Technical problems experienced by many fans to get tickets.
The play relies on an initial JK Rowling story.
It’s been co-composed by director John Tiffany and Jack Thorne,
Billed as the “eighth Harry Potter story and the first official Harry Potter story to be presented on stage”, the two-part play makes its world premiere at the Palace Theatre in London’s West End next summer.