I've got Elder Sign: Omens for the iPad and after resigning my first game halfway through I've won the next six, five of which were on the so-called "hard" difficulty, and all of which were with a random four person party. I was very disappointed that the Azathoth game was basically the same as the Yig game, it just took me a few more turns to amass enough elder signs. (Apparently Azathoth was the original game and Yig was added because other players found it too hard?)
There's a "very hard" Cthulhu expansion available for purchase, and it apparently does switch up the mechanics a little bit with some kind of break in the middle. Is this mode actually harder, or is it essentially like playing the Azathoth game twice in a row?