With this little plugin you can link a game of the digital distribution platform Steam by Valve.

After installing the plugin you can use the following code to display the game:

[steamgame]GAME_ID[/steamgame]

You can find the GAME_ID in the URL of the article in the steam store.

Expamle for the game "Portal": http://store.steampowered.com/app/400/Portal/
The green marked number 400 is the GAME_ID you have to use in the code.