The Liberty Falls vault is an Easter egg in Zombies mode, requiring a six-digit code found on three sticky notes across Liberty Falls, unique to each game.
The first note is located on the front counter in the Savings & Loan Building, slightly illuminated. The numbers found will dictate the order for entering the vault code.
To find the second sticky note, go to Fuller's Liberty Lanes, and look for it underneath a bucket of beers near the service counter; its position is crucial for the code.
The final note is located down a street near Olly's Convenience Store. Players must seek all three notes to access the vault and its contents.
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