Playing Through the Game
When you begin the game all of the levels are locked except for the first one. Every time you beat a level you will unlock the next one.
Level Unlock Code
To enter an unlock code you must click on the "code" button within the level select menu.
If you first beat the lite version before purchasing the full version, you may unlock all of the lite version levels by entering the code "ibeatlite".
If for some reason you want to give up and just unlock all of the levels you may enter the code "bounceme".