Blood vision:
Click the Right Analog-stick to activate your blood vision.

Defeating Banshees:
Be careful while fighting banshees. If you cut off their arms and they still live, they will fire non-stop energy balls at you.

Defeating Lazaurus:
While fighting Lazaurus for the final time, hide in the house when he is using his twister move; it will shield you. Also, when he shoots his fireballs and smoke clouds, shoot them; they will blow up and you will be unharmed.

Ducking:
Click the Left Analog-stick to duck.

Evil deed:
Blood Frenzy: Adds a supernatural boost to hand-to-hand combat.

Get Alien Unlocked:
Hold the Back + Start button and press Y, L, X, B, R, A, R, X. Now you will have challenges 43, 48, 49 & 50 unlocked and have bomb piece #5

Get All Boarders:
Hold the Back + Start button and press Y, L, X, B, R, A, R, B

Get More Points:
Hold the Back + Start button and press Y, L, X, B, R, A, R, A. Now you will have 9 million lift points and 9 million equipment points

Get Challenges Finished:
Hold the Back + Start button and press Y, L, X, B, R, A, R, Y. Now you will have challenges unlocked except 43, 48, 49, 50. You will also have all bomb pieces except #5

Extended ending:
Successfully complete the game and wait for the credits to end. An extended sequence featuring the game's true ending will begin.

59 (Kyd Konami Mix) - Jesper Kyd:
Complete Istanbul Café in heavy mode.

G2 - Aya Play 200 songs or:
Complete the extra one challenge

GYRUSS (FULL TILT) JT.1UP:
Complete 50 songs

I feel (T.O.Y remix) - T.O.Y:
Get over 12,000 points on the credits minigames

In My Eyes (Midihead) - Midihead:
Play 100 songs

Mae a Jam! (Dub and house mix) - Big Idea:
Win Make a Jam mode on all the difficulty settings

MAX 300 (Super maxmemix) - Jondi and Spesh:
Get a triple A rank on any song or complete Maxx Unlimited in Heavy Mode

Midnight Special - Love Machineguns:
Play 20 songs

Toe Jam - Big Idea:

Quest Mode Random NPC - Unlock Songs:
Meet up with the NPC randomly in Quest Mode.
Jelly Kiss (Midihead's SMAK mix) Trade the Newfoundland flag
ever snow Trade the Bismarch, North Dakota flag
Love This Feelin' (ZONK Remix) Trade the Yukon Territory flag
Right On Time Trade the New Brunswick flag
Frozen Ray (DIRTYHERTZ mix) Trade the Jackson, Mississippi flag
Music To Your Head Trade the Santa Fe, New Mexico Flag
Danca de Yuka Trade the Concord, New Hampshire Flag
Insaner Trade the Dover, Delaware flag
Colors (Midihead's Sapphire mix) Trade the Little Rock, Arkansas flag
Hinawari Trade the Charleston, West Virginia flag

Unlockable: Songs:
* Max 300 Super-Max-Me mix: Get AAA rating on a song or beat Maxx Unlimited on heavy mode
* Zero One: Get a AA rating on a song
* Gyruss Full Tilt Mix: Play 50 songs
* I feel... (TOY Remix): Get over 12,000 points in the credits mini-game.
* In My Eyes (midihead remix): Play 100 Songs
* Make a Jam! (Dub/House): Pass Make a Jam! on all difficulties.
* Toe Jam: Pass all of the Big Idea songs on heavy mode.
* .59 konami remix: Pass all jasper kyde songs on heavy mode
Faster Song Unlock:
It is much easier to reach the various song unlocking quotas by simply selecting a song in game mode. Once the loading screen disappears, hold BACK to exit the song. This counts as a failure, but it will count as a played song towards the quota.

All Cars and Tracks:
Enter SWEETAS and BONZER as codes for all cars and all tracks respectively.

In-game music select:
Enter STROOTH as a code.

Use any car in multiplayer mode:
To use any car in multi-player mode, where unlocked or not, select the desired car and press A on one of the other controllers. This can be done for any player.