How do you call that ..... ?
 

that wooden cube that the goal is to open it, but there is only a certain way to open it, a puzzle box ?
it's some kind of a brain teaser...

what's it called?

its boring.

They are called puzzle boxes, like you said. Sometimes trick boxes.

Correct!

The question is more confusing than the actual puzzle box.

No shit. The only puzzle cube I know of are

http://www.math.cornell.edu/~mec/Win...ubiks-cube.jpghttp://www.horror-movies.ca/AdvHTML_...be_email_1.jpg

I recommend to not try to do the 2nd one.

Thank me later : http://en.wikipedia.org/wiki/Rubik's_Cube

Soma Cube maybe

seems it's called a "burr puzzle"
http://en.wikipedia.org/wiki/Burr_puzzle