Efficiency

Level 1 of the Dungeon
(0, 0, D:1)
  a rat corpse
(3, 12, D:1)
  18 sling bullets

Level 2 of the Dungeon
(0, 0, D:2)
  a giant cockroach corpse

Level 3 of the Dungeon
(0, 0, D:3)
  5 gold pieces
(1, 7, D:3)
  a +0 spear
(5, 4, D:3)
  a potion of invisibility
(6, 6, D:3)
  a scroll of identify
(8, 2, D:3)
  12 gold pieces
(15, -17, D:3)
  a scroll of teleportation
(16, -15, D:3)
  a wand of flame (14)
(20, 10, D:3)
  8 gold pieces

Level 4 of the Dungeon
(0, 0, D:4)
  a giant cockroach corpse
(2, -2, D:4)
  a +0 war axe
(7, -17, D:4)
  26 stones
(9, -25, D:4)
  a potion of lignification
(12, -14, D:4)
  a leopard gecko corpse