Efficiency

Level 6 of the Dungeon
(0, 0, D:6)
  6 gold pieces
(12, 13, D:6)
  a scroll of teleportation
(13, 7, D:6)
  a +0 robe
(20, 5, D:6)
  10 gold pieces
(26, 0, D:6)
  20 gold pieces