XAH
Auto-translated
I'll answer in order. For a beginner:
1. The most difficult castle is the one that is hardest to build. It requires a lot of resources and money and doesn't have strong hero units. It immediately becomes clear that this is none other than the TOWER;
2. It is most difficult to develop or master INFERNO, as almost all units are melee and have low HP, and the only ranged unit is weak. In addition, when upgrading in battle, it affects its own units.
1. The most difficult castle is the one that is hardest to build. It requires a lot of resources and money and doesn't have strong hero units. It immediately becomes clear that this is none other than the TOWER;
2. It is most difficult to develop or master INFERNO, as almost all units are melee and have low HP, and the only ranged unit is weak. In addition, when upgrading in battle, it affects its own units.