Hard Mode Expeditions are available only on Special Expeditions. These expeditions are easy to identify by their purple border.

To unlock the Hard Mode Expedition, players must complete 300 stages.

How do you complete the stages?

A full Hard Mode Expedition consists of 300 stages and takes approximately 10 hours (2min/stage) to complete.

To start a Hard Mode Expedition, you will need Healing Potions and Phoenix Elixirs.

During the expedition, your Adventurer must stay alive at all times. Use Healing Potions to restore HP, or Phoenix Elixirs to revive your Adventurer if they are defeated. If you run out of these resources, the expedition will end prematurely.
Once all 300 stages have been completed, the expedition will be marked as complete with a visual indicator similar to the one shown below.

⚠️Once all stages are completed, the expedition ends, regardless of how much HP your Explorer has remaining.