Efficiency

Level 1 of the Dungeon
(0, 0, D:1)
  21 stones
(9, 21, D:1)
  a staff of death {!a}

Level 2 of the Dungeon
(0, 0, D:2)
  a book of the Senses
(3, 0, D:2)
  7 stones
(9, -7, D:2)
  a +0 dagger (still there?)
  a goblin corpse (still there?)
(9, -2, D:2)
  a stone
(10, -6, D:2)
  a +0 dagger
(10, -1, D:2)
  2 stones
(11, 0, D:2)
  a stone
(12, 2, D:2)
  a stone
(13, -9, D:2)
  8 arrows
(13, 1, D:2)
  3 stones
(18, 4, D:2)
  a stone (still there?)
  a +0 dagger (still there?)
  a goblin corpse (still there?)
(20, -12, D:2)
  an adder corpse
(21, 2, D:2)
  6 gold pieces

Level 3 of the Dungeon
(0, 0, D:3)
  a stone
(1, -1, D:3)
  a stone
(2, -1, D:3)
  a stone (still there?)
  a +0 mace (still there?)
(4, -5, D:3)
  a potion of lignification