What? You got bored of Brawl's, 'one button to rule them all' style already?! Tehe
Oh, and I believe the correct nerd term is 2.5d.
The term is usually used with computer graphics, especially video games, where a computer system uses 2D computer graphics to visually simulate 3D computer graphics. One such method is where a 2D image has an added "depth" channel or Z-buffer which may act like a height map. The term is also used to describe 3D scenes built completely or partially from a composite of flat 2D images; and also where gameplay is restricted to a 2D plane while the display uses 3D graphics and 3D models.