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Underground stamp
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| Underground | |
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| Information | |
| Available | ? |
| Type | Activities |
| Difficulty | Easy |
| Members only? | No |
| Stamp ID | 10 |
| How to obtain | Find the secret entrance to the underground |
The Underground stamp is a stamp in Club Penguin.
| Spoiler warning: Plot and/or ending details follow. Click “Expand” to view spoilers. | |
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How to obtain this stamp | |
| Spoilers end here. | |