Rescue the cows by shooting down the marauding UFOs. Save as many as you can. Fire your rockets at just the right moment, timing is crucial if you wish to avoid disaster.
There are two modes of play:
1) High score - How many cows can you recuse?
2) Raise the bar - How accurate is your timing? The better your hit rate, the faster the bar will rise. But beware, mistakes will see your progress thwarted.