This was an incredibly frustrating build. Numerous holes seemed to be drilled incorrectly, boards were mislabeled or missing. Multiple splits occurred even when using the pre-drilled holes. Seemed like we were hampered at nearly every step. Thanks to some ingenuity the end result looks good and will be a great play area for our two sons. I agree with other reviews describing the main floor as seeming weak. We are planning on adding some extra support underneath. If you purchase this set, prepare yourself for a journey of frustration surrounding what is otherwise a very cool piece of playground equipment.