A Billiard Table in the Library
Sometimes, you don’t need to provide a particular room for the entertainment.
Just use what you have had.
An idea is when there is a library available.
The books can be placed on the shelves around.
Then, the remaining space in the middle is prepared for the recreational stuff like the library.
Don’t forget to put a sofa and table to take a rest.
A small bar or at least a refrigerator is necessary to add for your own comfort.