Instruct: Classify an Amazon review as either positive or negative.
Query: Excellent, challenging puzzle for all ages

My mother bought this puzzle for my son who is 4 years old. At first it looked pretty easy, but as it was passed around the family, we quickly realized how hard this puzzle was! It says for ages 8 and up but my 38 year old husband couldn't even figure it out. After days of trying, my son finally got it! I highly reccomend this puzzle.