All you have to do is raise his Heart Color to Red and see all of his Heart Events. The events must be gotten in order.
Black Heart Event
-Leave your farm in the afternoon to get the first scene with Gray. He will introduce himself and tell you his grandfather is the blacksmith.
Blue Heart Event
-Go into the mine and go down three or so floors. You will see Gray. Talk to him and he'll he is looking for Silver. Use your Hoe to dig around. Keep looking until you find Silver. Give that to Gray and he will eventually give you a necklace when you leave your house one morning.
Yellow Heart Event
-Leave your farm after 1:00pm to get a scene with Gray. He messed something up with his Grandpa. It might only happen in Fall.
Orange Heart Event
-Gray will come to your farm in the morning and use your Windmill to make his own tools. A few days later he will finish. It doesn't work and he does back to work at the Blacksmith.
Red Heart Event
-Enter the Blacksmith shop and Gray will have made something his grandpa is proud of. Gray will then propose to your character.
Marriage
-One week after that event Gray will come to your farm and propose for real using s Blue Feather. If you accept the two of you get married and the game ends.
The game ends if you marry anyone.
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The game ends when you marry.
You can't marry the Goddess, but the girls you can marry are: Witch Princess ( her heart colour is invisible) , Julia, Natalie, Sabrina, Chelsea (the girl player that you can play in Harvest Moon DS: Island of Happiness) and Lanna, the popstar.
You cannot marry the Harvest Goddess in Harvest Moon: Back to Nature. Your options are Ann, Elli, Mary, Karen, and Popuri. You can marry the Harvest Goddess in Harvest Moon: Friends of Mineral Town.
Yes, you can marry Muffy on harvest moon ds, but it takes a while, i would suggest looking for websites like Fogu.com that tell you all aout harvest moon.
No, Flora is not a marriage candidate in Harvest Moon: A Wonderful Life. She is a marriage candidate in Harvest Moon DS.