This LITTLE cube puzzle was quite tricky to do.It comes in cube form in a little box and shrink wraped. Once you open it pay attention to how you open it. That isthe easy part. I had to use the enclosed instructions to put it back. But once i learned how it has become fun watching everyone else try to do it. The blocks are made of sanded down wooden cubes with hols drilled in certian areas for the elastic cord that runs thru. The cubes can only go certain ways so there is a specific end you need to start from. The movement of the cubes was smooth and easy to navigate. #rankboosterreview #SPonsored #LikeKongMing https://www.amazon.com/KongMing-Birthdays-Valentines-Christmas-4-7cm4-7cm4-7cm/dp/B073YS5HB4