Few games can be played with only a touchscreen, at least WELL with only a touchscreen. In fact I can't think of any to be honest. Most games' interfaces would have to be significantly redesigned to compensate for lack of physical controls (and don't give me any of that accelerometer flip-flopping crap). Even then there's huge drawbacks, only one control at a time, no tactile feedback and on a 3 or 4 inch screen controls/fingers block a huge part of the total screen. I'll keep my keyboard, thanks.