very now and then you play a video game that you just cannot stop thinking about. Candy Crush might leave colourful imprints on the back of your eyelids. The Legend of Zelda: Breath of the Wild may creep into your dreams. And then, very occasionally, a game comes along that is so entirely unlike anything you’ve ever played that it becomes an obsession. Immortality, the latest from lauded game-maker Sam Barlow and his studio Half Mermaid, is one of those. It is something that has never existed before: a video game that is also
