Harvest Moon DS Codes -

Bonus characters:
Have the Game Boy Advance game Harvest Moon: Friends Of Mineral Town or Harvest Moon: More Friends Of Mineral Town in the cartridge slot. Characters from the corresponding game will now appear in Harvest Moon DS.

Battle mini-game:
If you inspect your dog's house at 4:44 a.m.. The Witch Princess will appear and teleport you to the mine site. A battle mini-game adjacent some of the girls you can marry will begin. Win the mini-game and the Witch Princess will give you a diploma and the title of "Battle Master".

Memory mini-game:
When you wake up at 6 a.m., step outside your house and immediately re-enter to have the clock at 6:01 a.m. Look at the set of records on the shelf to begin a memory mini-game.

Eligible girls:
The girls that you can marry are: Harvest Goddess, Mermaid , Princess, Aafi , Arisa , Erisu , Kaarii , Reona, Marivia, Serena , Nasuka , Furen, and Muu.

The Harvest Witch:
Her birthday is on Winter 29. She lives in the small hut near the mansion. She likes Red Grass and Poisonous Mushrooms, and loves Rainbow Curry.

Building materials:
Fodder/Grass: Can collapse at any time and any weather. 
Wood: Will stand but will most likely collapse during any storm. 
Stone: Recommended material as it is much cheaper then Golden Lumber and still will not go collapse very often. You have about a 5% chance of it collapsing during a storm. 
Golden Lumber: Will never collapse but is very expensive at 100,000 G each.