Efficiency

Level 1 of the Dungeon
(0, 0, D:1)
  5 gold pieces
(7, -15, D:1)
  11 gold pieces
(7, -7, D:1)
  a +0 club
(7, -6, D:1)
  a dart slug corpse

Level 2 of the Dungeon
(0, 0, D:2)
  20 stones

Level 3 of the Dungeon
(0, 0, D:3)
  10 bolts