Left 4 Dead (Portable?)

From
Valve (the creators of Counter-Strike, Half-Life and more) comes Left 4
Dead, a new kind of action game for the PC and Xbox 360™ that features
single player, co-op and multiplayer game modes.

Set in the
immediate aftermath of the zombie apocalypse, L4D offers four expansive
"movie campaigns" that challenge you and your fellow survivors to
battle thousands of swarming zombies as you travel across the rooftops
of an abandoned metropolis, through rural ghost towns and pitch-black
forests. In addition to the movie campaigns, Left 4 Dead features a
Versus mode that allows you to play as the Boss Zombies.

System Requirements:

Minimum

Supported OS: Microsoft Windows XP / Vista / Vista64
Processor: Pentium 4 3.0GHz
Memory: 1 GB
Graphics: 128 MB, Shader model 2.0, ATI 9600, NVIDIA 6600 or better
Hard Drive: At least 7.5 GB of free space
Sound Card: DirectX 9.0c compatible sound card

Recommended

Supported OS: Microsoft Windows XP / Vista / Vista64
Processor: Intel core 2 duo 2.4GHz
Memory: 1 GB
Graphics: Shader model 3.0, NVIDIA 7600, ATI X1600 or better

Instructions:
1) Unzip
2) Run either of the .exe files
3) Enjoy!
-
I'm not sure if this should be posted as portable since there isn't any
installations. I managed to get it running just by running the exes.
-
If you would like to play online, google "Garena". They have step by
step instructions on how to start killing some zombies with your
friends online!

Downloads:
http://www.megaupload.com/?f=HNTITG2V