What is the hardest lego set to build?

One of the most challenging LEGO sets to build is the LEGO Creator Expert Taj Mahal set. This set contains over 5,900 pieces and is a replica of the iconic Indian monument. The intricate details and complex architecture of the Taj Mahal make it a difficult set to construct, requiring a high level of patience and precision.

Another challenging set is the LEGO Technic Bugatti Chiron set, which contains over 3,600 pieces and is a highly detailed replica of the famous sports car. The complex engineering and advanced building techniques required to assemble this set make it a difficult task for even experienced LEGO builders.

Overall, the hardest LEGO sets to build are typically those with a high piece count, intricate details, and complex designs that require advanced building skills. These sets can provide a rewarding challenge for experienced builders looking to test their skills and patience.