The level designs are on par with 3D Land in size and style. 3D Land has an edge at times because of the 3D too.
The graphics, quality and precision of controls, and music are on another level though in 3D World.
So far for me, I love the game, but it's not radically different from 3D Land. It has way more powerups though, and they all control very, very well. And 5 characters too.
I'd say it completely blows 3D Land out of the water in every single aspect and I love 3D Land. It's a huge step up.
Not even by a longshot. Galaxy 2 maybe, but even then I'd say they're about even, or this one might even be harder, but it's been a while since I played Galaxy 2,. i think it's easier than galaxy,