Currently, gravel and flint can be produced way too easy.
1 cobble can be crafted to gravel directly.
1 gravel can be crafted to 2 flints directly.
Flints are not needed in large quantities and I want to make them rarer.
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To produce gravel: Smelt stone in a furnace for 60 seconds. Expensive, but still possible.
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To produce flint: Craft them from 10 gravel.
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I want to generate flint in the world as an ore in dirt.
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Finally, I want to add more flint uses. Flint tools sound most reasonable. I think flint shears and flint spear sounds most reasonable,
as an alternative weak early-game tool.