Efficiency

Level 4 of the Dungeon
(0, 0, D:4)
  7 gold pieces
(5, 7, D:4)
  a potion of flight
(6, 2, D:4)
  a +0 scale mail
(8, -3, D:4)
  a scarf of shadows
(9, -5, D:4)
  a throwing net

Level 5 of the Dungeon
(0, 0, D:5)
  13 poisoned darts
(7, 5, D:5)
  an iguana corpse
(11, 8, D:5)
  a gnoll corpse
(12, 7, D:5)
  a +0 flail
  a gnoll corpse
(14, -5, D:5)
  a +0 club
(15, -4, D:5)
  a potion of brilliance
(21, -2, D:5)
  26 bolts
(39, 0, D:5)
  a book of Spectacle
(43, 1, D:5)
  10 gold pieces
(47, 3, D:5)
  13 gold pieces

Level 6 of the Dungeon
(0, 0, D:6)
  12 gold pieces