Harvest Moon: Island of Happiness Cheats - Nintendo DS
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Unlock Farming Crops
Ship 100 Spring Crops to unlock Cucumber.
Ship 100 Wheat to unlock Cabbage.
Ship 100 Summer Crops to unlock Onions.
Ship 100 Autumn Crops to unlock Yams.
Ship 100 each of 5 different crops to unlock Wheat.
Shipping 100 Crops from two out of three Seasons will unlock 2 Farming Characters.
Strawberries, Pumpkins and Spinach will be unlocked when you have unlocked 2 Farming Characters.
Unlock Area Near Tower
Raise Wada's Friendship to 7 Hearts or higher. In the 3rd Year, visit him to unlock the area near the Tower. Manfred will give you a random item daily. Save your game before you speak to him and reload in order to obtain Crops and Grains not yet unlocked.
Unlock Characters
Alisa - Meet her with Nathan
Denny - Catch 50 fish
Dr. Trent - Remodel the hotel
Eliza - Remodel your house
Harvest Goddess - Make an offering in the Harvest Pond
Lanna - Catch 70 fish
Nathan - Make two offerings to the Harvest Goddess
Shea - Build a bridge to the jungle
Wada - Meet with Shea
Witch Princess - Build a bridge to the mountains
Unlock Dog (Needs More Red Tick Beer)
Getting the dog on HMIoH actually isn't that hard. Talk to Mirabelle each day until she allows you to give her presents. When she allows gifts to be given to her, give her eggs or milk each day until you have two hearts on her, then simply talk to her every day to keep her at two hearts, until a rainy day.
When it is raining, go to the forest. She'll come racing after you, talking about a dog with a scarf. You look for her (apparently it's a girl dog) When you find her, Mirabelle will clean her and give her back to you (though it would be a better idea to of already of bought pet food before you get the dog).
The dog'll live in your stable. It'll take a while to get used to taking care of a dog, I would know, I accidentally went almost a week without taking care of her.