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Each castle spans four complete floors with randomized room connections, corridors, and staircase placements. This means every interior is different:

Stairs are scattered throughout corridors and rooms—explore systematically to find paths upward.
Rooms connect unpredictably, so dead ends are common. Mark your route with torches or blocks to avoid getting lost.
Towers contain vertical shafts that often lead between multiple floors quickly.

Bring plenty of torches to light dark corridors and mark your path back to the entrance.
Carry a pickaxe to break through weathered stone if you need an emergency exit.
Watch for mobs in shadowed corners—bring a sword or bow for defense.
Map mentally as you progress: note which corridors lead where, and remember that upper floors may have different layouts than lower ones.
Check room corners and alcoves for loot that may have generated during construction.

Take your time exploring—rushing through a four-story fortress often leads to disorientation.