The Mermaid Halo 2019 was obtainable between May 2nd, 2019 and October 12th, 2019. Its design features blue, pink and white spheres arranged in a circle, with many different colored pastel corals and shells on top and in the center.
If the player was successful in winning the halo, their screen would turn indigo.
If the player was successful in winning the Mermaid Halo, they would also receive the "Secret Waterfall" badge. The total amount of users who own it is currently undetermined. The description reads, "Only those who can sing the ocean's song can unlock the secret".
4710 people have obtained the Mermaid Halo 2019.