When in the mansion, you need to set the Fleur de Lis in this order: N, W, S, E. This will take you into the maze that is the garden. Set all the statues facing Venus to make your way into the grotto.
At the games menu, go to the sub-menu Cheats, then type in one of the following cheats to get acces to them:
- Et In Arcadia Ego: Alle bonussen vrijgespeeld.
- Apocrypha: Every part of the visual database is unlocked
- Sacred Feminine: Twice as much health.
- Vitruvian Man: God-Mode.
- Clos Luce 1519: Level select
- Phillips Exeter: One hit kills
- Royal Holloway: One hit weapon kills