My 3D puzzle

I came across this interesting 3D puzzle when I was shopping for Tong's birthday gift. These days I have been buying lots of birthday presents, foresee more will come as I age. Other than having health problems, the signs of aging are attending more birthday parties and funerals. 
Back to my puzzle, it was stated on the box for age 5 and above, " easy to assemble ", "no tools or glue required ". I  bought the most challenging design : Tigger Tree Top House for myself. Princess series for Tong and XJ ( though its not her birthday ). Well, its definitely much easier as compared to the hundred or thousand pieces of puzzle.  

I like the tree house !