Parappa The Rapper 2

Shuriken mode:
Hold R1 + R2 then choose a stage at the selection screen. Shurikens will replace the buttons during a song.

Fast start:
Hold L1 + L2 then choose a stage at the selection screen.

Blue hat:
Successfully complete the game to unlock a blue hat for Parappa. Press the Right Analog-stick at the "Press Start" screen to select the new color.
belkin.

Pink hat:
Successfully complete the game with the blue hat to unlock a pink hat for Parappa. Press the Right Analog-stick at the "Press Start" screen to select the new color.
belkin.

Yellow hat:
Successfully complete the game with the pink hat to unlock a yellow hat for Parappa. Press the Right Analog-stick at the "Press Start" screen to select the new color.
belkin.

Song test:
Successfully complete the game with the yellow hat to unlock a new dog house that allows you to listen to any song in levels that you finished with a cool rating.
belkin.

Bonus stage:
To unlock a bonus stage after any regular stage, finish the stage with a good score (near 1,000 points). You will be brought to Chop Chop Master Onion Head who gives you a fun, yet somewhat repetitious bonus game between the end of the stage you just finished and returning to the stage selection map.
Alex Morgan.

Secret song:
Go though the opening FMV sequence to the part where PaRappa is writing his name and all the characters appear. Wait until a demo of the game appears. Go though the demo and the opening FMV sequence will appear again. Go though that and go though the part where PaRappa writes his name and wait again. Instead instead of them showing a demo, the colorful noodles will appear on the sides of the screen and the song will start playing.
Badluckvixen.

Record mode and secret songs:
To unlock record mode, successfully complete the game with the yellow hat. Then, go to any level and get your meter up to "Cool". Complete the little alternate ending for that level and you will have the song for that level in record mode.
Michaelrobertl.

Sunny's music video:
Successfully complete the game with the yellow hat, then do the "Secret song" trick. Go though the whole song, then a music video with Sunny singing her intro music on stage will begin.
Badluckvixen.

Control time of day:
The game places Parappa's neightborhood at the same time of day indicated by the PlayStation2's time setting. For example, if you set the Playstation2's time to 11:30 a.m., it will be bright and sunny in the game. If it is 7:00 p.m., it would be sunset. If you set the time to 10:30 p.m. it will be dark outside.
Sateliteuser34.

Lyric remix randomizer:
Hold R3 before the start of a stage to switch the teacher's normal lyrics with one of the random improv lyrics that he or she would have used to test your style. This trick can be used with any color hat, but will not be noticed until you get the yellow hat. The lyrics range from good complex lyrics to the awkwardly easy mixes that you get when you do "Bad" or" Awful", and will not switch randomly in-play like it would if you dd not use the code. Note: The amount of time you hold R3 or pressed more than once before holding; or holding L3, may affect the remix.
DemiTrusdale.

Hint: Jump a rope in mid-air:
In level 4, the level with the moose, get your meter up to "Cool". The moose will fly away and you will have to jump a rope in mid-air.
Michaelrobertl.