BioWare has put up an unprecedented offer for owners of Dragon Age II by promising to honor every purchase of the fantasy RPG with a free copy of Mass Effect 2 on PC.

BioWare is calling it the Sequel Celebration. It's a special thank you for fans for helping with DAII's early success, which broke the 1 million sales mark in less than two weeks after release.

Owners of the game simply need to activate the online pass content that comes with their copy of DAII and visit this address and log in with the EA account associated to DAII. The free copy of Mass Effect 2 can then be downloaded through the EA Download Manager.

The offer is only valid until April 30, so be sure to grab it before the end of the month.