|There are two puzzles here.
The first is to get the 2 blue L-shaped pieces together to form a rectangle anywhere inside the frame.
The second is to form that rectangle in the top right-hand corner of the frame.
This was the earliest puzzle to use an L-shaped piece (in 1927).
Its name was given because in the original puzzle the two L-shapes were labelled 'Ma' and 'Boy' respectively and you were required to re-unite Ma with her Boy. Other pieces had words like 'Broke' 'No Work' 'Homesick' on them.
Each of the pieces is made up of 1, 2 or 3 unit squares.