Mass effect 3 was always an singleplayer game, but its new that it is included with multiplayer part of the game, which needs an serial key for it to be working. Software product for ME3 can be working on Windows XP and Winodws 7.
As usual, Gamestop's Game Informer grabbed an exclusive Mass Effect 3 announcement, the magazine subscribers were seized, and the information in it taken the entire Internet. In all this hurry and did not get too many details about the Mass effect 3, but here's what readers have shared with the rest of the hapless world: Mass Effect 3 will also start a comic book introduction, if you do not insert the recorded position of the second part. Depending on what you choose, with some characters you'll meet again, as some do not, but the setup is more or less the same as in the prequel.
SERIAL KEY: CHECK ABOVE FOR THE LINK TO GET THE SERIAL!(it should say: Click here to get the serial)
As far as gameplay, it seems that BioWare still plans to make a shift back towards the RPG elements. So we get more freedom in choosing skills, skill-tree will be expanded and will be able to move several times. Weapons again get the opportunity customiziranja modes and extras. Mass effect 3 will have multiple endings, and they will largely depend on whom you hold in your team and what alliances. Legit keys for steam will not be included, only for Origin software I finally confirmation - Multiplayer will not be.