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From wiki.Alumni.NET

The form of the GD coin is round, and it is yellow in color. The primary purpose of coins in this game is to improve your scores and achievements in the context of the game. You will add one coin to your overall coin count for every coin that you gather. You may spend these coins to unlock more features, as well as to purchase new characters and backdrops. On the other hand, collecting coins is not a simple task because they are sometimes positioned in areas that are difficult to access.

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