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Rare Mullet is an insanity difficulty stamp in Club Penguin Rewritten. It can obtained by catching the Rare Mullet at the end of classic mode of Ice Fishing.
- It was the first insanity difficulty stamp on Club Penguin Rewritten.
- There is only a 1 percent chance of the Rare Mullet appearing instead of the Mullet.
- The Rare Mullet will appear red until it swims directly under the fishing hole.
- You don't actually need to catch the mullet, since the stamp is derived when the Rare Mullet appears on screen.