Mansions of Madness is one of my favourite board games for the last year or so. The players are a bunch of Occult Investigators trying to solve Lovecraftian mysteries. It's a fully cooperative game, with an app that takes care of all monster generation and so on.
I much prefer it to the first edition of the game, where you had a game master playing all the baddies.

My latest blog post about it.

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The Shoggoth:

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Investigators and deep ones

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More pictures and words can be found on the blog!