Misleading title is misleading. But it got you here, didn't it? 
Figures. The 3DS isn't powerful enough for Valve software, anyways.

David Turnbull from 3DS Blog said:Chet Faliszek of Valve has said that ?we?re about people sitting on their couches or at their desks? when asked if the developer would be interested in working with [COLOR=#009900 !important][FONT=Arial !important]portable[/FONT][/COLOR] devices. He also notes that ?it?s just not a space our engine has been looked at or optimized for.? This means we shouldn?t expect Valve to work on anything for the 3DS, which is not that surprising. But at least we have clarity on the matter.
Figures. The 3DS isn't powerful enough for Valve software, anyways.