Click a tool, then click a gnome. Blocker stops others. "Dig ↓" (digger) tunnels straight down. "Dig →" (miner) tunnels horizontally through rock in the direction the gnome is facing. Builder lays a staircase up. Parachute lets one gnome float down safely from any height.
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Level 10 — the long descent
The gnomes descend from ledge to ledge. Walk off the wrong end and they drop all the way to the floor and don't survive it. Place blockers at the dangerous edges to turn the crowd around, or hand out a parachute for a soft landing.