Review on UGEARS Wooden Mechanical Construction Learning Kit by James Ramirez

This is one of the hardest wooden puzzles I've ever put together. Unfortunately, there is a possibility of several irreversible critical defects that will ruin the model, and instructions that only contain pictures do not protect against them well enough. I found only page 66 had one part misaligned, hundreds of parts and it was impossible to fix. Most puzzles have multiple tests to prevent this, as well as pieces to prevent them from being put together in the wrong order. It's frustrating because the puzzle obviously can't be put together in one sitting, so from a functional point of view many days are wasted because I misassembled a construction that had no guarantees. assembled (thankfully none of them were critical or load bearing). I love this brand and have collected several sets of these so I am very disappointed in this one. Hopefully they can repeat this to prevent parts from being assembled in the wrong orientation.