3. Dead Space
Dead Space is one of the scariest survival-horror games I've played to date. Sure, the cheap pop-ups were the reason for most of that; but it also had its moments. The ending in the first game was that 'hook' that made players purchase Dead Space 2. The ending 'hook' is the reason the Dead Space movie should be made into a trilogy: that way, the writers will have some space to tell a detailed and compelling story. Of course there are some ways this wouldn't work as a movie. For one, each movie would be more of the same; rendering the final movie to be bland (Paranormal Activity 4 anyone?).