Enter the passwords (case-sensitive) at the Passwords screen:
Effect - Password
All Chapters Unlocked - ger1eng5
All Events in the Day - alltimes
All Secrets - farleymydog
Change Guard Size - Muffin
Core Events - coretimes
Defiance - Fatty
First Person Mode - Boston
Guard Perception - Quincy
No Chapters Unlocked - defaultm
Toggle In-Game Saves - Togsavecan
Top Down Mode - Foxy
Unlimited Cash/Rocks - Dino
View Game Creation Date and Time - Dt