Pogo has released new levels for Quinn's Aquarium (Touch Pool Exhibit - Part 2). You may not be able to see the new levels until you completed the previous ones.
New levels are released on the second Tuesday of each month, so the next release will be available on June 11th.
https://www.pogo.com/games/quinns-aquarium-mahjong
Good luck to those who can get past Mangrove 24!
(https://i.imgur.com/bDlkJa9.png)