Bloody Knives are used to unlock event buildings at the Hannibal's Dinner Table and can be obtained in the following ways:
- Making Mort Lay a Rose on Muriel's Grave
- Making Bonnie Study Serial Killers
- Making Chris Try Method Acting
- Making Meg Make a True Life Documentary
- Making Connie Ride on a Blimp
- Making Lois Follow Pipes
- Making Joe Arrest Automations
- Making Bruce Grow Out His Mustache
- Making Herbert Write Down the Killer’s Name
- Making Victim Peter Buy Tools
- Making Victim Peter Stick Out His Tongue
- Making Detective Cleveland Decode the Zodiac Killer's Messages
- Making Rich Widow Lois Spend Peter's Inheritance