My grandson received this as a Christmas present from an uncle several years ago. Since that time, we have been working to assemble it every now and then when we can get together. Took it outside in the heat this week to see if the pieces might fit together better if they softened up. Result? No luck. Most of the pieces don't stay together once you 'lock' them into place, or some pieces are so poorly made they don't fit together at all. It was a huge waste of money for his uncle and a bigger disappointment for my grandson and both his grandfathers.