To be found:
  1. Compass
  2. 3,000 Mesetas
  3. Fang for Myau
  4. "Stonded" Odin
Special Tips:
Not much, set Odin free with some Alsulin and don't forget the compass.

Don't bother about the locked door in the hidden passage. The enemies wait behind are much too strong for you, so feel lucky that you don't have the key right now.
NOTES

Normal Entrance / Exit Chest / Info Manhole Trap
Stairs up Stairs Down Normal Door Hidden Passage
AGENDA