Efficiency

Level 5 of the Dungeon
(0, 0, D:5)
  8 gold pieces

Level 6 of the Dungeon
(0, 0, D:6)
  24 stones
(3, -16, D:6)
  17 arrows
(7, -3, D:6)
  a +0 halberd
(12, -9, D:6)
  a +0 leather armour
(12, -7, D:6)
  9 gold pieces
(15, -17, D:6)
  a +0 helmet

Level 7 of the Dungeon
(0, 0, D:7)
  6 stones
(2, 1, D:7)
  14 stones