Rune Delver
Dig through a bomb-filled mine with your crew before the 20-second timer runs out
Hold the mouse on a stone tile to dig it. Numbers appear and gold comes in. Clear a floor and you gain 5 seconds and go one floor deeper; dig a bomb and you lose 5 seconds. When the timer hits zero, spend your gold on the skill tree and set out again from B1.
You start with one dwarf. The elf flags bombs she can deduce from the numbers with runes, and the nun lights up safe tiles, one every 3 seconds each. The elf finishes her reasoning on the spot before walking over to the bomb, and when the nun lights a tile, a dwarf digging at random drops what he is doing and heads there. Train them and they reason faster and grow in number, until they keep digging even with your hands off the mouse.
Floors grow from 6×6 at B1 as you go deeper, through the Earthen Tunnels, Stone Tunnels, Crystal Caverns, Magma Depths and the Mithril Abyss. 25 skills to learn.
Mouse only: hold to dig, right-click to flag. A run lasts from 20 seconds to a few minutes.