Enemies
=======

* Enemy roaches (red)
* Rat
* Human

Vehicles
========

* Walking
* Roomba
* Quadcopter
* Robot

Weapons
=======

* Spit
* Butter knife
* Crowbar
* Gun

Only one weapon can be equipped at a time.
Smart is used for the ranged weapons (spit and gun).
Strong is used for the melee weapons (knife and crowbar).
Damage depends on the total number of roaches with the appropriate attribute
in the vehicle.

Serums
======

* Smart -- operating important things.
* Strong -- pushing stuff around and opening doors.
* Fast -- speed.