I acquired this for my grandson, he loves Lego's and building toys. Problem is, as an adult with a particular toy like this, once you have it built, you kind of want to keep as is. He likes to take apart and build again and again, unfortunately losing pieces. This is that toy, take apart and rebuild, but with some care and attention to remaining pieces. The instructions on this are a bit complex, as well as the bags. This is my 4th set of building blocks: Lego, Collector Lego, Tok Moc guns, and now Vevor toys. In the Lego sets and Tok Moc, there are multiple bags, numbered, that run with the instructions. In turn, though, these are 1 item to build with an ideological order of build. With STEM, this came with a choice to build 5 different models, so the bags did not come numbered, and when you started, you kind of had to find your pieces from start and open that bag first. A bit of a guessing game. So, the end game, several hours in two days of building, we had a model complete. My grandson did 99% of the work, I came in to figure a couple odd pieces to the instructions that didn't seem so clear, and to help with the final, \"How does it run?\" First, there will be pieces left over, I do not believe any of the models, we chose one of the 2 larger ones to build, will use everything. The pieces overall seem to be one of a kind, not duplicates to build all models together. So, just enough pieces to build 1, or take apart and build another, but not all pieces fit on each model. Second, not all pieces are theoretically needed. We found 2 clear, solid rubber hoses. Unsure, we left them until the instructions provided a use, then we didn't use them. These connect the motor compartment to whatever flashing lights are set on the model. Instructions are a bit confusing in winding and wrapping the hoses around the figure, at the time of placement, and they kept coming loose as we proceeded with the next steps of the model. We removed them and left them out. N
Bigfoot Industries 
Chris L. Flynn 
