You can experience Easter Egg of all OS versions of Android.

Gingerbread : Zombie Art
Honeycomb : Android Honeybee
IceCreamSandwich : Nyan Droid
JellyBean : BeanBag
Kitkat : DessertCase
Lollipop : Lollipop Land (Supports Jellybean MR1 and above)
Marshmallow : Marshmallow Land (Supports Jellybean MR1 and above)
Nougat : Neko (Supports Lollipop and above)
Lollipop Marshmallow User : Check widget
Nougat Oreo User : Check quick settings
Oreo : Ocquarium
Pie : Paint
Android10 : Icon Quiz (Supports Marshmallow and above) [NEW]
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Google is annoying me with unreliable policy surveillance
attempting to remove the app due to a policy violation.
I hate google!!