MediumConfidence: 0.88
To Hell and Back
Cleared all stages of Survival Hell.
Global unlock
21.9%
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What to do next
SourceKeep pushing through Survival Hell's later stages — the layouts stay fixed each attempt, so learning enemy placements pays off on repeat tries.
Watch the timer on stages 4-5, since unavoidable damage kicks in there; if you need to bail, you can exit between stages on the final dungeon.
The final stage's boss combines all the previous stage bosses, so go in with every item upgrade you've collected.