I just downloaded the demo version, which has four modes: Story Time, Normal, Hard, and Nightmare. I then paid for the game, and it only has 2 modes. What's up with that? The reason I paid for it was for the 4 modes.
The 3 difficulty modes got consolidated into one, after testing feedback. Basically, you either play story mode if you don't like the hotel management aspect and normal, if you do.