Cat and mouse
This code is over 6 months old. The code may have expired and might no longer function.
4-6 players -> 1 cat
7-12 players -> 2 cats
Sorry for my dumb English :P
Mouse: run out from cats and rescue mouses with melee attack.
Rescue 20 mouses -> mouse win.
Cat: catch mouses.
Cats catch all mouses -> cats win.
For 10-12 players you may manually choose bigger map.