When I first got these lego mario sets back in 2020, they were fun to use and the app made it even better, today I reinstalled this app and it was very laggy, mario would not connect at first and the app kept closing randomly and when I open a set of instructions. The lego itself was quite fun to use, you do need a solid and flat surface to use it on due to it breaking easily, overall I think kids would prefer it if you didn't need any apps to get the instructions, make the sets more secure.