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 (Supports All) [NEW]
Android10 : Icon Quiz (Supports All) [NEW]
Android11 : Neko Controls (Supports Lollipop and above) [NEW]
**** Lollipop Marshmallow ... Android 10 User : Check widget
**** Android 11 : Device controls (https://developer.android.com/guide/topics/ui/device-control?hl=en)
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2021.03.24
Sorry for the late release
I am taking the main job off. So it was possible to release
Hobbies are difficult :)
2020.09.04
app was also delete.. The reason is impersonation..F..
2020.08.10
Recently the app was also deleted.. I don't know why...
I haven't been able to download the app for several days.
The update operation has been delayed.
Change the age of users who can install the app from ALL to 16 years of age or older.
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Google is bothering me with unreliable policy surveillance.
Every time you try to delete an app for a policy violation.
I hate Google!!!!!