The classic original Half-Life game has been unofficially ported to Android devices and it looks awesome.
Valve’s debut title blends action and adventure with award-winning technology to create a frighteningly realistic world where players must think to survive. Also includes an exciting multiplayer mode that allows you to play against friends and enemies around the world. Half-Life APK, an unofficial homebrew version, can be downloaded from below links.
What's new 0.16.1:
CRITICAL FIX: Fix servers scan
Use hlsdk-client instead XashXT
The game requires Android 4.0 and up
How to install:
2.Copy “xash” folder to sdcard/
Half-Life 0.16.1 APK + Sd DATA (/Android/data/)
Don't forget to also download Half-Life 2 on your NVIDIA Android device.