Zool 2

Level skip and extra jumping height. 
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From the option screen press ESC to get 
to the config menu.  
Then type the word "phonebook" and press 
ESC again. Now while you're playing the 
game pressing " 0" will take you to the 
next level and pressing "3" will get you 
to a bonus stage. Also you will be able 
to jump higher with [CTRL]