More:Harvest Moon DS: Unlockables

From GameWinners

Contents 1 Bonus characters 2 Battle mini-game 3 Memory mini-game

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".
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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.