As I'm writing this, I am actually trying to download HL2 (Half-Life 2) for Android. Funnily enough it's not for gaming purposes (well, not really.) I'd like to get screenshots in-game of certain maps, with the proper camera orientation/angles for a scene or two I'm planning on filming, and I know the Steam version would probably slow down my computer somewhat.
The download keeps failing though, 'cos the file's too big (I think). Oh well!