[Fathom Zero]

Some discs work with some disc players, others work with others. This is why one can put some discs in their Xbox, but not all of them. I've got a nice Sony stereo that can play just about anything I throw at it.

If you need to find out what works with what, use the internet.

And it probably has nothing to do with region coding. I've played a number of Japanese and German CDs in my stereo. My guess is that it's completely random whether it will work or not.