This post is meant for people that are having troubles completing some of the early puzzles in this mod.
WARNING: there are obviously spoilers here...
The lever puzzle
It is very important to look into every window in the first level.
The pig puzzle
You need a knife to open the pig in the kitchen. The dining room can help you with that.
The Library Puzzle
The items in the round chamber can be placed on top of the altars.
The Basement Puzzle
Even the darkest corridor can contain secrets. You need, however, 3 levers in order to get the treasure within.