Efficiency

Level 4 of the Dungeon
(0, 0, D:4)
  13 gold pieces
(3, 5, D:4)
  12 gold pieces

Level 5 of the Dungeon
(0, 0, D:5)
  9 gold pieces
(0, 5, D:5)
  20 stones
(5, 2, D:5)
  9 gold pieces
(6, 6, D:5)
  13 gold pieces