starcraft II is best Strategy game. the full copy of game is not yet released. this is the starter version which is available for free with a free registration. but if u dont want to register u can download this game for free click here
install notes:
after downloading, just run the setup and select the path where u want to download the game, when thats completed, just install it, now ur game is ready to play.
Enjoy.....Hav Fun!