Interesting idea. The game could check every second. If the mouse is seen, every cat gets [Z] points. If not, the mouse gets [Z] points. It would both reward good mouse hunting for the cats and good hiding for the mouse. I could add a (!) over the mouse when it's being seen.

Edit:
Since the mouse moves faster than the cats, I could have a bonus ramping up for each consecutive second the mouse is seen.

Interesting idea. The game could check every second. If the mouse is seen, every cat gets [Z] points. If not, the mouse gets [Z] points. It would both reward good mouse hunting for the cats and good hiding for the mouse. I could add a (!) over the mouse when it's being seen.