When Valve's surprise-hit title Portal was announced for NVIDIA Shield, we were a bit skeptical. However, reviews suggest that the Source Engine, used to create every Valve game since the launch of Half Life 2 in 2004, has been successfully ported to Android. While Portal is available exclusively on the NVIDIA Shield, it can technically run on any Android device that has a powerful spec sheet (it should arrive at the Play Store officially sometime later this year).
The hot news is that Half Life 2 is making its way to Shield. I know, this isn't the Half Life news that you have been waiting for (Jesus Gabe, it's been 7 years, just give us Half Life 3 already), but fans of the 2004 classic can relive those moments on a portable console, which runs on Android, once the game is released later this year.
For now, Shield owners will have to make do with Portal, which arrives on May 12.