Efficiency

Level 4 of the Dungeon
(0, 0, D:4)
  a potion of brilliance
(16, 15, D:4)
  7 gold pieces

Level 5 of the Dungeon
(0, 5, D:5)
  a potion of curing
(6, -6, D:5)
  10 gold pieces
(11, 2, D:5)
  a +2 hunting sling of freezing
(14, 5, D:5)
  a +2 dagger of speed
  a +0 robe
(15, 3, D:5)
  a +0 whip (still there?)
  a +0 scale mail (still there?)
  an orc corpse (still there?)
(15, 5, D:5)
  a +0 whip (still there?)
  a +0 leather armour (still there?)
  a +0 club (still there?)
  a +0 leather armour (still there?)
  an orc corpse (still there?)
(15, 7, D:5)
  a +0 mace
(21, 10, D:5)
  a +0 giant spiked club (still there?)
  an ogre corpse (still there?)
(22, 5, D:5)
  a +0 giant club
  a quokka corpse
  an ogre corpse
(24, 1, D:5)
  a ring of protection from cold

Level 6 of the Dungeon
(0, 0, D:6)
  13 stones