Well, my first mistake was buying these for my 4 year old. I should have stuck with the larger Duplo blocks, but because his older brothers have been really into Legos lately, I figured I should get some for him, too. Anyway, with some help from his 7 year old brother, my 4 year old was able to build the space shuttle mostly by himself. He played with that for awhile before letting his older bro change it into the boat. Then, after one fateful trip to the bathtub, we were missing one or two pieces. That didn't stop the 7 year old from transforming the boat into the airplane (minus an exhaust). Now I believe the set is in several pieces around the house.Even so, this was still a very cool set of Legos. I love the 3-in-1 Creator series because it doesn't limit them to just one toy. And even though they may never build these 3 the same way again, those pieces will definitely get used again in building even bigger and better Lego monstrosities.We bought this for our five year old and he was able to put this together on his own. It's a great Lego for little kids.Kids loved it!my kids built one model take apart and go for the other models. so althoug fairly simple provides plenty of play time.This is sold directly from LEGO for five bucks and toy r us for seven bucks, watch what you pay for this toy. These 3-in-1 kit containers are very nice little kits. You get directions to make 3 models. It's usually worth it to get more than one of these, and use the models as inspiration for your own similarly themed creations.This review may only be legally shown directly on Amazon.comEasy to put together I am 10 and I love playing with it fun to play with especially with Lego peepsBy Zach, who is 4 years old: "I really like it and I really want to keep it. It was really really fun to put together and I had help from my Dad."