I got this puzzle long time ago in a magazine dedicated to puzzles. I don't remember neither the name of this puzzle (if anyone can help me), nor the difficulty, nor the type of wood used...
The only thing I remember is that is was quite cheap.
The goal is to put together the several pieces of the puzzle to make a pyramid as you can see below:
The pieces of this puzzles are balls glued together to form different shapes.
As for the difficulty, I would say that it's not easy, but not very difficult; I would say medium.
You need to fiddle around which piece you put first, and then try many combinations with your remaining pieces, put in a different way the pieces (they can move).
To conclude I would say that this a a fun puzzle to play with, and it is always funny to let it try to your friends and see that they have some difficulties to start this puzzle ;-)
Will you start like this...?
Or will you start like that...?
POST EDIT: the name is "The infernal pyramid" and the magazine was called "Classic Puzzles & Brainteasers". Unfortunately I did not keep it (I cannot find it...) ;-(