Legend of Mana
Playstation

Find a Chocobo:

To get a Chocobo as a pet, have a Final Fantasy 8 saved game on the same memory card as the one used for Legend Of Mana. Enter the save screen, highlight the Final Fantasy 8 file, then exit out of the save screen. When you catch a bird egg in the eastern section of Domina it should hatch into a Chocobo.

Hidden Sword:

Have a saved game from SaGa Frontier 2 on the same memory card as the one used for Legend Of Mana. Enter the save screen, highlight the SaGa Frontier 2 file, then exit out of the save screen. Enter Bone Fortress and head toward the bridge where you fought the DeathBringer. There will be two skeletons at that location. When you approach them, you will fight eathBringer 2. After beating it, you will get the strongest sword from SaGa Frontier 2.

Get Fastest Wheel:

Beat the "Catchin' Lilipeas" quest and have a saved game from Chocobo Racing on the same memory card as the one used for Legend Of Mana. Highlight the Chocobo Racing file, then exit out of the save screen. Go to Polpota Harbor. On the Polpota Harbor map screen Skippy, the thin big eared creature from the "Catchin' lilipeas" and "Huntin'Du'cate" quests, will appear and hand you a ring item called "Fastest Wheel."

Shadow Zero Mini-Game:

Beat the then "Jewel hunter" quests (The Lost Princess, The Flame of Hope, Drowned Dreams, The Looking-Glass Tower, The Lucky Clover, Cosmo, Two Pearls, Alexandrite, Flourite, and Tear Drop Crystal). When those events are finished, go to the bar in Domina on Salamander day. You should see a Shadow Zero standing near the counter. Talk to him to play the game.

Land Bopper Mini-Game:

Get nine lands in full view on the world map (which should resemble a slanted tic-tac-toe board). Hold L1 button for approximately 4 seconds to get the Land Bopper start screen to appear.

The Forbidden Tome:

After you beat the game save, then load the saved game go to the Encyclopedia. There will be a new book; Forbidden Tome, it will have Normal mode, Knightmare mode or No Future mode.

Catch Egg Monsters Every time:

Try dropping a variety of fruits and meats and when the monster starts eating wait until you see a grey line or grey exclamation mark in the thought cloud above it's head, but if you see a red X in the cloud then its not going to eat anymore and you should try reentering the area you saw the monster.