There are four difficulties in Castleminer Z to choose from in Survival Mode:
- No enemies: You are free to build and craft weapons without being attacked although you can die from hazards such as lava and long falls. You can turn enemies on after creating your world from the difficulty selection screen.
- Easy: Undead spawn less frequently and stronger enemies spawn longer items in selection bar upon death are kept.
- Normal: Undead spawning is increased during the day and is doubled at night items in selection bar are kept upon death.
- Hardcore: The world's going to hell. Undead spawn rapidly between day and night and if killed all inventory is lost.