From the options screen, go to the Hats section and select 'Enter your code', then input the following codes to unlock all of the secret hats for Snoopy.
Hat | How to unlock
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| - Charlie Brown, Pigpen, Linus, Lucy.
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| - Sally, Schrodinger, Snoopy, Marcy.
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| - Woodstock, Charlie Brown, Pigpen, Linus.
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| - Lucy, Sally, Schrodinger, Snoopy.
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| - Marcy, Woodstock, Charlie Brown, Pigpen.
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| - Linus, Lucy, Sally, Schrodinger.
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