G-nome
To unlock G-nome complete Challenges 11, 12, 13, 14, and 15 in Mega Challenge mode .

Robin Hood
To unlock Robin Hood complete Tournament 13 in Mega Challenge mode .

Huff N' Puff Wolf
Finish Tournament 20 in Mega Challenge mode to unlock Huff N' Puff Wolf.

Luna
Complete Challenges 26, 27, 28, 29, and 30 in Mega Challenge mode to unlock Luna.

Humpty Dumpty
Complete Bonus 4 in Mega Challenge mode to unlock Humpty Dumpty.

Anthrax
Complete Bonus 7 in Mega Challenge mode to unlock Anthrax.

Super Speed power-up
From the Title Screen, press L1(2), R1(2), L1, R1, L1, R1, Square, Circle, Triangle(2).

All challenges
From the Title Screen, press Triangle(3), Circle(3), Triangle, Square, Circle, Square(3), Up, Down, Left, Right, L1, R1 to unlock all challenges.

Dronkey
Complete Tournament 7 in Mega Challenge mode to unlock Dronkey.

Quasimodo
Complete Tournament 3 in Mega Challenge mode to unlock Quasimodo.

Slammageddon
From the Title Screen, press Up(2), Down(2), Left, Right, Left, Right, Triangle, Square(2), L1, R1.

Pizza Three
From the Title Screen, press Down(2), Right, Circle, Up, Triangle, Left, Square, L1(2).

Pizza One
From the Title Screen, press Up(2), Triangle(2), Right(2), Circle(2), Down(2), L1, R1, Left(2), Square(2), L1, R1.

Pizza Two
From the Title Screen, press Circle(2), Square(2), Right(2), Left(2), L1(2).

Captain Hook
Complete Tournament 25 in Mega Challenge mode to unlock Captain Hook.

All Story mode chapters
From the Title Screen, press Triangle, Square, R1, Circle to unlock all Story mode chapters.

Cyclops
Complete Challenges 36, 37, 38, 39, and 40 in Mega Challenge mode to unlock Cyclops.

All medals and trophies
From the Title Screen, press R1, L1, Triangle, Square to unlock all medals and trophies.

All characters and levels
From the Title Screen, press L1, R1, Square, Circle to unlock all characters and levels.

Top Tips
Use Shrek's butt slam to clear enemies away from Shrek.
Charge your throw to fill your SLAM meter quicker.
The Black Knight is very powerful so if fighting a powerful enemy like Captain Hook use the Black Knight.
Never waste a chance to SLAM if the meter is full.
Always collect powerups.
Throw things into to enemies if you get the chance to pick something up.

Top Tips
Use Shrek's butt slam to clear enemies away from Shrek.
Charge your throw to fill your SLAM meter quicker.
The Black Knight is very powerful so if fighting a powerful enemy like Captain Hook use the Black Knight.
Never waste a chance to SLAM if the meter is full.
Always collect powerups.
Throw things into to enemies if you get the chance to pick something up.