Efficiency

Level 1 of the Dungeon
(0, 0, D:1)
  a +0 robe
(1, -10, D:1)
  a +0 hunting sling
(1, 12, D:1)
  4 gold pieces
(4, -7, D:1)
  a +0 robe
(4, 7, D:1)
  a kobold corpse
(7, 7, D:1)
  a stone
(8, 7, D:1)
  a stone
(9, 6, D:1)
  2 stones
(10, 7, D:1)
  a stone
(19, 0, D:1)
  a +0 robe
(20, -4, D:1)
  a +0 club

Level 2 of the Dungeon
(0, 0, D:2)
  a +0 ring mail
(11, -1, D:2)
  a +0 troll leather armour
(12, 3, D:2)
  a +0 hunting sling

Level 3 of the Dungeon
(0, 0, D:3)
  a potion of curing
(12, 5, D:3)
  9 gold pieces

Level 4 of the Dungeon
(0, 0, D:4)
  a scroll of remove curse
(2, -3, D:4)
  16 gold pieces
(4, -3, D:4)
  2 potions of invisibility
(5, -15, D:4)
  10 gold pieces
(5, -5, D:4)
  a +0 leather armour
(6, -9, D:4)
  a +0 spear
(7, -13, D:4)
  11 gold pieces
(7, -6, D:4)
  a scroll of remove curse
(9, -13, D:4)
  a +0 mace
(11, -14, D:4)
  13 gold pieces
(13, -13, D:4)
  8 stones
(14, -12, D:4)
  18 stones