It's a good day to be an NVIDIA SHIELD owner. Valve's Android ports of PC shooter classics Portal and Half-Life 2 just dropped in the Play Store for $10 a pop. They're only for the SHIELD (even other devices with the Tegra 4 chipset aren't invited to the party), which is a bit of a mixed blessing - these games really require a full controller to play.
Valve teased an Android release for the 2007 classic Portal way back in March, but we only heard about the Half-Life 2 port last week (via crowbar).

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[New Games] NVIDIA Releases The SHIELD Versions Of Portal And Half-Life 2 At The Same Time was written by the awesome team at Android Police.