Final Fantasy II/Mission to Mysidia

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 any 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 slingshot (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;