This is the Happy Dungeons Management Team.
Right now, there are the following issues in Happy Dungeons:

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Issue Details: Currently unlearnable Skills displayed as learnable.

Affected Skills: B Skills indicated as “???” for each class and the Mage A skill Magical rifle*The above skills will be made available in future updates.

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We apologize for the inconvenience, and hope to see you in Happy Dungeons again soon.