My 4 year old son LOVED. He asks for more. I helped him for the first assembly but now he spends his time was up and disassemble the 3 alone models. The only problem with Lego (when we began to broaden his collection) that is not to lose the coins. Personally, I bought a small round plastic drawers where my son ranks each record with the pieces in freezer bags zipped. If quelqun a better idea I am taking? And construction uses a tray and / or the tray. As already lost pieces of a plane he can not ride it well assimilated. I saw recently that you could redeem lego pieces on the site. So Lego assistance: - Be organized - Sorting - Follow a manual step by step - Be persevering but as imaginative as it invents new models. Warning: never mix and store the various boxes of lego in one box! Otherwise hello time to spend to sort the coins. But we can always let her do the stupidity once, repair and make him take the lesson. My son has understood and became autonomous. That did not stop to ask me for help just for fun to spend time with me.