Korsakovia is a new experimental mod by the makers of Dear Esther. It's a survival horror about delusion, paranoia and the end of the world.
Resolution Magazine said they've "Never played a game that fucked with me so much" and that "It’s rare for a game to instil such panic. It’s up there with ‘Shock 2 and Silent Hill in that respect".
Hide the matches, break the TV screen, gouge out your eyes, turn out the lights and play it on your own late at night.