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SHAFTFALL
Ore 0 +0/s
Ingots 0 +0/s
Gems 0 one per level
Cinder 0 ×1.00 everything
Depth 0 the grass line

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Smelter the rest is banked as ore
Dig deeper —
Gas nothing down here yet

Gems permanent — they survive the collapse

Collapse the shaft

Reach level 8 to unlock the collapse. You keep the cinder, the gem upgrades and the record; you lose the shaft.

Record

Deepest: 0 Room best: — Ore ever: 0 Collapses: 0

Space swings · 1–4 buy · E digs · G spends a gem · S saves · C collapses. The shaft keeps working while you are away, at a reduced rate, for up to two hours.