Preview: Yoshi's Woolly World (One more analysis ).

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Hynad said:

And DKC isn't 2.5D. The graphics are 3D, but the movements are all in a 2D plane, even when the camera moves around.

I'm gonna nitpick here; there are parts of Tropical Freeze where movements are 3D, like hopping between mine cart tracks in High Tide Ride, or some of the barrel blasting in Cannon Canyon.