The YuXin 17x17 was once the largest mass produced puzzle available but that was beaten by ShengShou's 19x19 and MoYu's 21x21 and the MoYu 21x21 has stood as the highest order cube you could buy for a few years now. There have been various brands teasing larger puzzles but nothing has ever seemed serious, however, maybe this time YuXin are serious. If they genuinely release a 29x29, it will be an incredible achievement, they could have made a 23x23 or 25x25 but they chose to go all the way to 29x29. In this video, I react to some of their bad english and commentate on their promotional video, I also question some of the maths regarding the number of pieces. I have no idea how much this will cost but if it does get released then I will be able to source it for the UK/Europe market to anyone interested.