Once inside the game, type the following cheatcodes to enter all of the levels in the game:

levelcodes: 

2 - rewards 
3 - premier 
4 - ostrich 
5 - diamond 
6 - strayed 
7 - prophet 
8 - coached 
9 - shorter 
10 - visible 
11 - tuneful 
12 - unicorn 
13 - readers 
14 - connect 
15 - cartoon 
16 - freedom 

And enjoy as usual of course ;) 

(c) Team PiZZA