The Da Vinci Code

Go to codes at the options menu then type the code in:

Result - Code:

One Hit Fist Kill - Phillips Exeter
Double Health - Sacred Feminine
God Mode(infinite health) - Vitruvian Man
All Visual Database entries Unlocked - Apocrypha
All bonuses Unlocked - Et In Arcadia Ego
Level Select - Clos Luce 1519
One Hit Weapon Kill - Royal Holloway