
the only thing that you have to do is: shoot the aliens!! 
sometimes when you have shoot a alien a white extra remains.... 
the extras can be very usefull!! 

the extras are the following
x  extralife 
3  better shot 
s  shield 
r  brakes 
[] smartbomb (filled rectangle)
if you lose a life, then the catched extra is losed,too!

the game works with some code-words for level skipping
enter the codewords,when the game ask: 1 or 2 player game? 

