Which floors it remembers

The elevator at the entrance goes to floors you have already reached that are multiples of 5. Reaching floor 40 adds 40. Walking past a stop without landing on it does not add the ones you skipped.
The Danger in the Deep quest resets the elevator. Floor 120's other changes stay.
| Stop | Why it is useful |
|---|---|
| 5 | First return point, still in the opening copper floors. |
| 15 or 20 | Deeper copper, past floors 1–9. |
| 40 | Iron nodes run from 40 to 79. Floors 41–79 are where iron is concentrated. |
| 80 | Gold nodes start on floor 80. |
| 115 | Last crimson stretch before the bottom. |
| 120 | Skull Key. 120 is a multiple of 5, so the elevator can return here once you have stood on it. |
Coal on the way
A few fixed floors hold six coal. They are worth a short stop when you are already passing through.
| Floor | Where |
|---|---|
| 12 | Minecart at the end of the path. Ladder is already there. |
| 18 | Minecart, bottom right. |
| 28 | Minecart, bottom right. |
| 38 | Minecart, top left. |
| 52 | Bag at the end of the path. Ladder is already there. |
| 58 | Bag, bottom right. |
| 78 | Bag, top left. |
| 92 | Ladder is already on the floor. |
| 118 | Minecart, top left. |
Skipping a floor
A staircase, unlocked at mining level 2, spends 99 stone and drops a one-use ladder. You cannot pick it up. It cannot be placed on floor 0 or floor 120, in the Quarry Mine, or in the Volcano Dungeon. Leaving the mines removes it.
The Desert Trader sells one staircase for one Jade on Sunday. In year 1, Robin sells stone at 20g, so 99 stone is 1,980g. From year 2, stone is 100g and a bought staircase is 9,900g. Staircases stack to 999.
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