After you have claimed the offer you can download the game anytime ,anywhere from your origin account
In Battlefield 3, players step into the roles of the elite U.S Marines.The missions include location including Paris, Tehran and New York.It is first person shooter game,where the story is set in Iraq and Iran
To get the free game you need to create origin account if you are not having which is an free account and download origin client standalone installer
you can also get another award winning game Plants vs. Zombies™ Game of the Year Edition which will be available free till 16 june 2014
click here to get BATTLEFIELD 3
click here to get Plants vs. Zombies