I am taking on the innawoods challenge right now, completely primitive with no buildings or spawns.
Recent updates allows for a path to crafting soldering iron and welding units. However, there is no way to craft batteries to power them.
There is the dry batteries, which should fullfil this role, but they have the following path to craft
Dry battery <-- acidic electrolyte paste <-- hydrochloric acid <-- sulfuric acid
The problem starts at sulfuric acid which has two recipes, one that require platinum and the other hydrogen peroxide neither which is obtainable or craft able in a innawoods challenge where there is no civilisation.
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