Efficiency

Level 3 of the Dungeon
(0, 0, D:3)
  13 gold pieces
(10, -3, D:3)
  a +0 scythe
  a +0 robe

Level 4 of the Dungeon
(0, 0, D:4)
  16 gold pieces
(0, 2, D:4)
  13 stones
(12, 11, D:4)
  an adder corpse
(14, 10, D:4)
  a +0 club
(15, 10, D:4)
  13 sling bullets
(15, 15, D:4)
  12 gold pieces
(18, 8, D:4)
  16 arrows

Level 5 of the Dungeon
(0, 0, D:5)
  18 stones

Level 6 of the Dungeon
(0, 0, D:6)
  a potion of ambrosia
(1, 2, D:6)
  a scroll of identify
(3, 5, D:6)
  24 arrows
(8, 0, D:6)
  a potion of ambrosia