CP3D has officially been shut down as of January 7, 2023. Waddle on! Read the blog post >
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Coins are the main currency in CP3D. Penguins can purchase clothing, furniture, and adopt puffles with coins. Coins can be earned by playing minigames. 500 coins are also received for registering an account.
Fluffy the Fish is engraved in the coins.
CP3D Official Wiki