Dead Space is free for download on Origin until May 8, 2014.
If you haven't experienced it yet, give it a try! The game uses the elements of the genre splendidly. It deserved the worthy title of 'Great Game' due to its story line, stunning atmosphere, sound effects, and music.
Link of the game: https://www.origin.com/en-ie/store/buy/dead-space-ANW.html