I don't see how level X 10 is possible. Two lions and two zebra.
The sense that "this level is obviously, trivially impossible" is always a goal in puzzle design, and I was pretty pleased to achieve it in such a small level here!😁
It's a little sneaky; if you still need a hint, I don't think it's possible to do spoiler tags in this comment markdown so I'll use rot13: Lbhe bowrpgvir va gurfr yriryf znl abg or rknpgyl jung lbh guvax vg vf.