Can anyone help me where is Code playground?

Answer 1

It's here
https://www.sololearn.com/Codes/

Answer 2

If you're using the app (Android) then look at navigation bar at the bottom. Code Playground is the one represented by "Code" with { } symbol.

If you're using the web, Code Playground can easily be accesseed from the menu, or footer links.

Direct web access:
https://www.sololearn.com/codes