You need to do certain requirements. You should mostly aim for 60 sprites because when you do then you can get married, and rescue the harvest sprites. then work your way up from there.
Here are a few easy ones:
Chop 100 small sticks with your axe.
destroy 100 small roks with your hammer
Press 'a' on the fountain in front of romana's mansion
press 'a' on the water well next to he blue bar.
More information to finding the harvest sprites can be found here:
http://www.fogu.com/hm6/chan3/sprites/index.php
Chat with our AI personalities
If you mean the third Harvest Sprite Channel in Harvest Moon DS or Harvest Moon DS Cute, all you have to do is rescue 20 Harvest Sprites. After your twentieth Sprite you will automatically unlock your twenty-first Sprite who runs Channel 3.
Which Harvest Moon game? There is more than one Harvest Moon game about saving the Harvest Goddess. Always include the full title. If the game is just "Harvest Moon" add what system the game is for. Because there is more than one game called just Harvest Moon. In Harvest Moon DS all you have to do is find 60 Harvest Sprites.
You have to find all 101 harvest sprites
To save the harvest goddess all you have to do is get 60 Sprites.
you have to have an action replay and then you get 96 of them