I passed up on these at first but I finally got one during a sale at Toys R Us, and I have to say, it sure is a lot of fun to play with! What is it? Basically, it's like a Lego toy but with Hot Wheels instead! There are multiple pieces that can snap together to create your very own custom Hot Wheels car, or in my case, a custom Bone Shaker. Overall, it's pretty awesome!