My 4 year old daughter plays with these at school, and one day I went to pick her up and she had constructed a massive castle with these and it was quite complex. I asked her who helped her and she said nobody helped her. This was more elaborate than anything I had seen her do before, so I knew I needed to get some of these for her at home. She wants to build things with them everyday. She makes houses, castles, mazes, crystals, and anything else she can come up with. I have see these really spark her creativity and imagination. I would absoulutely recommend these to anyone as they are fun, easy, and have endless possiblities for kids of many ages.