"Portable gaming" refers to the activity of playing video games on a device that can be easily carried around, such as a handheld console or a smartphone. Full definition
This is a tablet with two smaller screens which can be folded and is reminiscent of portable gaming consoles. (tabletpcreview.com)
Very little is known about the machine other than it is intended to bridge the worlds of portable gaming and the console that sits under the TV. (theguardian.com)
Some of the more skilled programmers and builders have created portable gaming systems using small 3.5 inch screens, however this takes a little more skill and isn't for the casual programmer. (littletechgirl.com)