Which castle is the most difficult?

For me, it’s easiest to play as Tower. Mostly thanks to the gremlins and mage heroes. As for the most difficult, hmm... probably Inferno or Necropolis. I used to really dislike playing Inferno because of the demons; they take so long to move around. It might seem silly, but that’s the reason. Now I’ve installed an animation speed booster, so I can play as Inferno now, although I need to understand the concept of demonology first. Playing as Necropolis is harder than playing as other factions because liches aren’t built immediately, and you need sulfur, which isn’t always available on days 1, 2, or 3. Although you can micromanage in the early game.