U.F.O. is a bonus which clones new Zombie every few seconds.
- Level 1 (default), Clones zombies so you have more of them
- Level ?, The UFO lasts 5 seconds longer so you can clone even more zombies.
- Level 42, The UFO lasts 5 seconds longer so you can clone even more zombies.
- Level 179, A second UFO joins the first to clone even more zombies.
There is a number of missions which require UFO bonus. For example:
- Clone 12 zombies with the UFO
- Clone 10 zombies in mid-air with the UFO
Images Edit(Did you know you can actually still survive with zero zombies in the u.f.o bonus?)
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