Agatha Christie - And Then There Were None cheats and cheat codes for PC

Open safe:
Before you try to open a safe, save your game.
To open the safe: clicking left arrow to get 28 to be under the top arrow, 
right arrow to 11 and left arrow to 49. You will hear a click and then you 
can click on safe handle. If you made a mistake, load back your saved game.

Possible endings:
You can see different endings, depending on who is saved and who died:
Good ending - Narracott, Lombard and Vera are saved. 
Narracot+Lombard ending - Narracott and Morley (Lombard) are saved.
Vera+Narracot ending - Narracott and Vera are saved.
Naracott ending - Narracott alone is saved. 

Find antidote:
If Narracott is poisoned, you have to find the antidote. The antidote is 
turpentine oil and you will find in Bellman's Universal Embrocation.

Safe puzzle:
Once the safe has been opened, inside is a small drawer with slots with the 
letters A, E, E, E, H, L, R, S, T, U, V and W. Notice the poster above the 
radio just outside the safe. You will find the answer there in a song that 
Patrick sings. The answer to open this second hidden door is: Rule the Waves.