Play a game of hide-and-seek!
The child (or children) that lives here has it all figured out! This appears to be one of the most entertaining playrooms ever. And, while their “secret” room isn’t fully hidden, it is only accessible via the small crawl-through entrance near the bottom.
There are plenty of opportunities to say hi (or to try to surprise folks)! What a fun and creative environment for a child to grow up in.