"My 7 year old son built this set on his own in just 3 days. He is an advanced Lego builder and has built over 90 sets. His favorite collection is NINJAGO. On this set he liked the gear mechanism. In his opinion, the bridge that has slicers - could be more secure to the set. He knows the cage is likely everyone's favorite part, but his is the ladder because not many Ninjago sets come with a ladder. He thinks the minifigures are impressive. He can't wait to connect #71717 to this set!"