Instruct: Classify Amazon reviews into positive or negative sentiment
Query: so tricky.....

We have had this puzzle for my son since he was less than a year and he has always liked puzzles. We have always found this hard for him. NOw he is almost 2 1/2 and can do 24 piece floor puzzles but still "doesn't get' this. The overlapping nature of it is so hard because he is looking for a spot to fit the piece in his hand and there are none!! People have told me he is pretty smart for his age and he LOVES puzzles but he just can't figure this out....