If you haven't been keeping up with the news of late or haven't played SimCity, to put it simply the game as been causing a lot of problems for fans that wished to play it which is due to server problems from EA's side.
Today EA and Maxis (the team that created the game) issued an apology for all the difficulties and to make it up to the fans, everyone who has activated their copy of SimCity will recieve an email giving directions on how they can get their free Windows PC download of an EA game. The portal where everyone can select their game is being opened up country by country however it will be available worldwide by March 22nd.
In order to get your game, you need to register your copy of SimCity by before March 26th and thereafter, claim your free game by March 31st. Below are the list of games which you'll be able to choose from, some of which have been released pretty recently.
Battlefield 3 (Standard Edition)
Dead Space 3 (Standard Edition)
Mass Effect 3 (Standard Edition)
Medal of Honor Warfighter (Standard Edition)
Need For Speed Most Wanted (Standard Edition)
Plants vs. Zombies
SimCity 4 Deluxe Edition