Efficiency

Level 1 of the Dungeon
(0, 0, D:1)
  13 gold pieces
(2, -19, D:1)
  a gold piece
(2, -15, D:1)
  13 arrows

Level 2 of the Dungeon
(0, 0, D:2)
  30 stones
(7, -5, D:2)
  a cursed -1 club
(8, -5, D:2)
  a kobold corpse
(8, -1, D:2)
  a cursed -3 whip

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

Level 4 of the Dungeon
(0, 0, D:4)
  a +0 robe
(1, 12, D:4)
  9 gold pieces
(36, -17, D:4)
  a scroll of blinking
(38, -33, D:4)
  21 arrows