5 players are "mice", 1 is the "cat".
The cat (BLOO), gets an assortment of cyber/mech units (pandoras, command units, apollos, ares) to try to kill the mice citizens.
When a mouse player loses 3 citizens, they lose - the other 2 citizens are deleted, and they get 3 invincible citizens at the bottom left corner to try to help the other mice survive.
To try to survive, the mice can build towers, walls, anti aircraft, barracks, hospitals, universities, houses.

If the cat player does not kill 3 of each player's citizens by f11 60, the cat loses.