This puzzle has three (3) pieces where each one has the shape of the capital letter L, but each one had a different size.
There is a Large L, a Medium L, and a Small L.
The wooden frame of the puzzle has 2 sides (each side is actually a wooden tray) and therefore there are 2 challenges to this puzzle.
Challenge 1 (Easy)
You will notice that one side of the frame has a rectangle tray area and this is the first and the easier challenge: to fit the 3 L pieces into that rectangle area of the frame.
Challenge 2 (Harder)
The other side of the frame is non-standard tray and has angles and many corners and this is the harder challenge of the puzzle to fit the 3 L pieces into that non-standard area.