Final Fantasy II/Mission to Mysidia

Speak to Princess Hilda and Prince Gordon. They will tell you that Minwu has left for Town of Mages in Mysidia and has been uncontactable for too long a period. They will send you to find him. At the same time, Princess Hilda will tell you about the White Mask and Dark Mask, one of which is hidden in the basement of Castle Fynn. Speak to Prince Gordon about the masks and he will tell you that Paul who resides in Fynn Town (bottom left corner) knows of how to enter the secret room. Paul will say that the entrance is to the far end of the audience room, to the right of the throne.

Fynn basement
Item checklist:
 * GF: golden shield, golden armor, gold cuirass;
 * B1: eyedrops, clothes, knife;
 * B2: ether, maiden's kiss, potion;
 * B3: spider silk, hi-potion, flame shield;
 * B4: betrayal fang, power staff, flame armor;
 * B5: orichalcum dagger, White Mask.

Mysidia
Town services:
 * Inn
 * Magic shop
 * Item shop
 * Weapon shop
 * Armor shop
 * Library: "talk" to the bookshelves and "ask" (i.e. read books) about every keyword.
 * Goddess shrine: use the White Mask on the statue.

Tropical island
Item checklist:
 * B1: eyedrops, 2 hi-potions, ether, spider silk;
 * B2: sleepgrass, 2 Scourge tomes, 2 Blind tomes;
 * B3-a: spider silk;
 * B4-a: (no chests); passage to the surface (GF);
 * GF-a: (village with shops);
 * B3-b: garlic;
 * B4-b: 1000 Gil; there are four stairs leaving this floor to the areas marked as "B5-b", "B3-c", "B3-d" and "B5-e";
 * B5-b: death idol;
 * B3-c: phoenix down;
 * B3-d: (no chests);
 * B4-d: (no chests);
 * B5-d: 2 sleepgrass, Gaia drum;
 * B5-e: Sleep tome, Black Mask.

BOSS: four Big Horns
Use the various battle items you found against them: you don't want to carry loads of unused items with you, do you?

Mysidian cave
Item checklist:
 * B1: gold hairpin, black garb; use the Black Mask on the Doppelganger;
 * B2: flame lance, power staff;
 * B3: ogrekiller axe, Ice Bow (walk through the wall to get it);
 * B4: potion, bell of silence, phoenix down, gold needle;
 * B5: potion, 2 hi-potions, ether, Mini tome (walk through the wall to get them), 2 Drain tomes, Osmose tome, Crystal Rod;