This is where gaming should have been 9 years ago.

I came across the following article .  When I bought a PSP back in 2005 this was the first thing that came to mind.  A few years later when smart phones really caught on with consumers I was shocked that this didn't exist.  Well here we are in 2014 and maybe by summer we will finally reach the promise of playing a video game anywhere we want on any device we choose.  What would be the one game you would want to take with you any time and anywhere?  Discuss!