You'll need Wine, steam installer, some fonts.
Wine
On terminal:
sudo apt-get install wine
Once wine is installed, download these fonts.
http://thepemberton.com/posts/downloads/fonts.7z
or
http://rapidshare.com/files/299699800/fonts.7z
you will also need a 7z extractor:
sudo apt-get install p7zip-full
Extract them to ~/.wine/drive_c/windows/fonts/ .
Steam Installer(msi)
http://storefront.steampowered.com/download/SteamInstall.msi
Save it to desktop.
Installing Steam
on terminal
cd ~/Desktop
msiexec /i SteamInstall.msi
and follow the steps to install Steam.
-Download the games and you're ready to play the game.
Re-launching the game
Create a ".sh" file on desktop and edit it with text editor
cd ~/.wine/drive_c/Program\ Files/Steam
wine Steam.exe
save and run...
you might need to add rights for execution
cd ~/desktop
chmod +x "filename.sh"
Credits to wiki.ubuntu.com and thepemberton.com