Nintendo really outdid themselves here when it comes to level design and creating new and interesting mechanics, and I'd say that as far as 2D gameplay goes it never got better than this for the series. Even though YI focuses more on item collecting than previous games, it is done in a way that makes it much more rewarding than any other game of its type that I've played, and I was obsessed with fully completing each level. The game is full of memorable moments and I like how new elements are often used only for a particular level to make it stand out more. It's a shame less effort was put into the sequels. Gripes? Well, it was pretty disappointing to get everything and have the game barely even acknowledge it.