Harry Potter And The Half-Blood Prince (DS)
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This game is titled Harry Potter And The Half-Blood Prince in North America, Europe, and Australia and Harry Potter to Nazo no Prince in Japan.
Easy Gobstones win
When you play Gobstones, touch the red marble with the stylus (Harry's) on the touch screen, then go back with the stylus. Take your stylus off the marble while the stylus is all the way back. Harry's marble will hit a green marble, and it will be instantly knocked out and thats the tip.