Harvest Moon: Island of Happiness is a farm simulation video game published and developed by Marvelous Interactive in Japan, and released in North America by Natsume exclusively for the Nintendo DS. It is the fourth installment of the Harvest Moon series on the DS and the first one to give players the opportunity to choose between a female and male main character.

The story is pretty basic, with the player choosing to be either Mark or Chelsea who are stranded on a deserted island together with their family of four people. In order to survive, the player must farm and grow his own food, fact which will attract other character to the island and, steadily but surely, will develop the local community. The actions of the characters are controlled with the touchscreen, with a much more improved control scheme than the previous DS titles in the Harvest Moon franchise.

This game uses the Nintendo Wi-Fi service for a farm ranking service, and a voice chat session using the built-in microphone of the DS. The game received mixed reviews, with critics complaining of long distances which need to be traveled on the island and that, at the beginning, even the simplest tasks are very difficult and can easily scare off any casual gamers. Here are some of the things you can unlock in this interesting game.

UNLOCKABLES

Sub-villagers

Complete the indicated task to have the corresponding person appear. 

Older Women 
Annabelle: Upgrade the road to the beach area and East Town is available. 
Winona: Upgrade the road at the Island Hotel. 
Moira: Visit the forest area. 
Thelma: Original Inn is built and East Town is available. 
Nicole: Madelynn is on the island 
Bea: Win over 5 Festival events. 
Madelynn: Over 10 sub-villagers have appeared and East Town is available. 

Children 
Brook: Sean is on the island. 
Rita: Expand the Original Inn. 
Daria: Over 15 sub-villagers have appeared and East Town is available. 
Emma: Child born to Vaughn and Sabrina. 
Jean: Child born to Pierre and Natalie. 
Kelly: Child born to Elliot and Julia. 
Ross: Child born to Denny and Lanna.

Here's a video of this game: