Um Jammer Lammy

Bonus Stages:

Beat any 2 stages in the normal game to unlock 2-player Lammies.
Beat 2-player Lammies to unlock 2-player vs. Lammies.
Beat the 1-player game to play as Parappa.
Beat 1-player Parappa to unlock 2-player Lammy Parappa.
Beat 2-player Lammy Parappa to unlock 2-player vs. Lammy Parappa
Get Bonus Parappa Levels:
Finish the game, return to the level select screen and press Right until the bonus levels appear.

Custom Lyrics & Notes:
As soon as Lammy appears on the title screen when booting the game, immediately reset the Playstation system. When the game restarts you should have a new menu next to Lammy's guitar on the title screen.