Why is my floating mob farm not working?

The problem is like that, I built a standard mob farm like that high in the sky at 100 blocks, but sadly it is not producing any mobs. Why is that?


Solution 1:

If you do play in PI version then notice there are no mobs.

I assume you must have noticed the very limited gamearea as well as other limitations.

However it is cool it runs on that piece of hardware.