Myster Books alternate endings etc...

Hi... its my sons upcoming 11th birthday and I want to get him an
interesting book (as he has read every Harry Potter/Dragon/Narnia set).

I remember when I was younger reading books that depending on a
decision (use the sword, use the potion) would send them to a certain
different page that would dictate different 'paths' in the book.

Does anyone know what these types of books are called or where I would
find them?

Thank you so much.

Julian