The following list tells you what special abilities the weapon attachment Gems which take one space will do.

Ruby:
+10 Mimic, +10 Fire, +10 Speed.

Amethyst:
+10 Ice, +10 Mage, +10 Dino.

Opal:
+10 Mage, +10 Steel, +10 Endurance.

Sapphire:
+10 Flying, +10 Wind, +10 Magic.

Peridot:
+5 Attack, +10 Plant, +10 Animal, +10 Holy.

Topaz:
+5 Attack, +10 Undead, +10 Flying, +10 Speed.

Diamond:
+ 5 vs. All Creatures, Extra +5 vs. Steel.

Garnet:
+10 Animal, +10 Rock, +10 Fire, +5 Attack.

Pearl:
+10 Endurance, +10 Undead, +10 Thunder.

Aquamarine:
+10 Flying, +10 Sea, +10 Ice.

Turquoise:
+10 Rock, +10 Mimic, +10 Ice.

Emerald:
+10 Dino, +10 Plant, +10 Magic.

When you have successfully completed the game and saved it the Demon Shaft will be selectable under the 'Go To Other Areas' map. This is a very difficult dungeon which has 100 floors.

Get Across A Town Faster -
To get to a destination faster in walking mode enter Edit mode and move the pointer to where you want to go and exit Edit mode.

Gameshark Codes
Master Code (Must Be On) -
EC8393F8
1445ACCC

Infinite HP Toan:
4D5C1682
1456089C

Infinite Speed Toan:
4D4BC7EE
145625DD

Infinite Water Toan:
4D5C5B76
145625DD

Max HP Toan:
4D5C1676
1456089C

Infinite Gilda (Money):
4D5C5BB6
1456B00C

Max Dagger Level:
4D5C5D7E
1456300C

Infinite Dagger WHP:
4D5C5D8E
14562509

Max Dagger WHP:
4D5C5D8C
1456E78C

Max Dagger Stats:
1D5C5D84
1473E788