When Valve brought Portal out in 2007 it revolutionized what one expected from first-person puzzle-based video games. The game offers challenging puzzles to players that are based on physics and reality. Why are we talking about Portal today? Valve will be releasing Portal for Android devices on May 12th for $9.99 on Google Play. It turns out that most of the development work was done by NVIDIA as they wanted to bring big name game titles like Portal and Half-Life 2 out for NVIDIA SHIELD owners...