BioWare are offering anyone who purchases, or purchased, Dragon Age II before the 30th April a free PC download copy of Mass Effect 2.
The move comes as a thank you to everyone who helped the game sell more than 1 million copies in two weeks.
To get your free copy of Mass Effect 2, you need to Activate the Online Pass content that came with your copy of Dragon Age II, boot up the game and login, or create, a new EA pass account. You can then visit a dedicated page for the offer and enter your Online Pass code at which point you'll be provided with a code to use in the EA Download Manager.
The official site also provides information to those who have lost their Online Pass or have bought the game second hand.