Alien Isolation is one of my favourite games ever. I tell people this all the time, I discuss the game in depth, I recommend it to everyone -- only, I've never actually finished it.

The game is just so long -- which isn't a bad thing when you like a game, but with a genre like horror, sometimes shorter is better. In fact, the genre is just crawling with amazing, contained experiences, many of them free to download: here are my favourite six.