3D World is still great too. They changed it so that dying doesn't reset the green stars you've collected so far in the level, and also sped you up significantly; the combination of those things made it feel way easier to me. I got to π-π with barely any trouble this time. (Champion's Road is still rough, but I got decently far into it within my first couple tries so I feel confident I could polish it off given a bit more time.)