We love these crafts! My almost 3 year old daughter is able to do them (with some help, of course). It's so great to have everything we need included in the box, plus the developmental guide is very helpful too.
Bought the Junior Box for my almost 3 year old but it was too advanced. It's not developmentally accurate to expect a 3 year old to trace a small item with a pencil and then count small squares on graph paper. Even the tools provided were too small - she could barely use the toothpick-sized mini pipette. I wish I had seen the other reviews that said the Junior Box was too advanced for the younger kids.