The most recent entry on this list, SOMA was only released a few weeks ago at the time of writing and yet has already become one of the scariest games of the decade. Whether thats a testament to its quality or the lack of other good horror games is for you to decide. It was developed by the brains behind Amnesia: The Dark Descent, and if you played that then SOMA will feel slightly familiar. Theres a similar eerie quality to the environment, and the corridors and rooms are just as confined and claustrophobic as ever. This time, however, theres a stark contrast between the cramped interior of the underwater base, and the endless dark abyss of the ocean floor outside so its a bit more of a dilemma as to which one youd rather be in. The monsters are just as terrifying, as well hideous things that you cant look at for more than a brief second before having to run away and hide. As with their previous titles, the emphasis on building a tense and suffocating atmosphere is the source of a great deal of the tension and fear in the game. If you havent seen it before, then check it out being new, not many have explored it to the limits as of yet.