Hidden Hats
In the Options Menu, where you can rename your alien, use the following names to unlock hidden hats for the 2 player game:
* cletus
* april
* superfly
* goodman
* grrl
* abe
* princess
* dandy
Level 3-4: Extra lives
After fighting the Boss (giant green robot with the eye and a fork and knife) and his life reaches zero, he will start exploding. Continue shooting at his eye. He will just continue exploding as long as you shoot, and you will continue gaining points. You can stop when you have about 60,000 points. At the end of the level, you will gain about eventeen
lives.