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

 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"