R'lyeh Rising is a hidden identity game where you try to convince the other players that you are on their team in order to help you to align the stars correctly so that you can either release Cthulhu or keep him safely imprisoned in R'lyeh.
Players draw random team affiliations, which they keep secret from each other and each player has a page from the Necronomicon which tells how the stars need to be aligned in order for them to complete their part of the ritual. By spending points, each player can move the stars in order to get them properly aligned.