Codes
Enter these codes at the password screen.

Play as Sweet Tooth
Enter Circle, Circle, L1, L1, Start as a password.

Play as Minion
Enter Up, Start, Down, L1, Square as a password.

Unlimited ammo - Triangle, Circle, Up, Right, Down
Better homing missiles - Triangle, Left, Down, Right, Up
Make weapons hit harder - Triangle, Circle, Down, Left, Up
No heath pick-ups in level - Select, L1, Select, Start, Circle
Ice levels - Up, Up, X, X, Up
99 freeze missiles - Triangle, Up, Circle, Right, Start
Unlimited specials - L1, L1, R1, R1, R1
Invincibility - L1, Square, X, R1, Start

Level Codes

Auger
D.C Left, Select, Circle, R2, Up
Hangar 18 L1, L2, L1, Triangle, R2
North Pole Circle, Select, Start, Up, Select
London Select, L2, Triangle, L2, Up
Tokyo Start, Select, Right, R1, L2
Egypt Down, L2, X, Square, Triangle
Blimp R2, Square, L2, Select, Start

Axel
D.C Square, Square, L1, R2, Left
Hangar 18 Left, Start, Triangle, R1, Square
North Pole Up, Square, Triangle, Select, Square
London Left, Left, Down, Start, Start
Tokyo L1, X, Square, Left, Left
Egypt Circle, Down, L2, L1, R1
Blimp Select, X, X, X, R1

Club Kid
D.C Down, X, Up, Right, Down
Hangar 18 R2, Right, Circle, L2, L1
North Pole Triangle, Circle, Down, Triangle, X
London Square, Right, Square, Square, Up
Tokyo Circle, R2, Start, Right, R2
Egypt Right, Right, Down, R2, X
Blimp Left, Triangle, R1, L1, Circle

FireStarter
D.C Circle, Triangle, Circle, Right, Circle
Hangar 18 Select, Up, Left, Up, R2
North Pole Start, Triangle, Select, L2, Circle
London Down, Start, R2, R1, Select
Tokyo R2, R1, Square, Up, Square
Egypt Triangle, Start, R1, L2, Down
Blimp Square, R1, Right, Down, Triangle

Flower Power
D.C Right, R1, Left, Circle, Up
Hangar 18 L2, Select, Select, Left, L1
North Pole L1, L1, L1, Up, R1
London Circle, Start, Left, Square, Up
Tokyo Select, L1, Triangle, R1, Start
Egypt Start, Right, X, Left, X
Blimp Down, R2, X, R1, Up

Hammerhead
D.C Start, Left, L1, Right, Down
Hangar 18 Down, Square, Up, L2, Right
North Pole R2, Left, Circle, Triangle, R2
London Triangle, Square, Down, Square, Circle
Tokyo Square, Left, Square, Start, L1
Egypt Square, R2, Down, Up, Square
Blimp Right, Down, L1, L2, Up

Minion
D.C R1, Down, Up, Select, Select
Hangar 18 X, X, Circle, Up, Up
North Pole Down, Left, Left, L2, L2
London Start, Circle, Select, R1, R1
Tokyo Down, Right, R2, X, Square
Egypt R2, Circle, Start, Left, X
Blimp Triangle, Right, R1, Right, Left

Mr. Grimm
D.C Triangle, R2, R2, X, X
Hangar 18 Square, L1, Triangle, Down, Start
North Pole R2, Start, Select, L1, L2
London Right, Select, Triangle, Start, X
Tokyo L2, L2, Down, Left, X
Egypt R1, Select, Square, L1, Down
Blimp Circle, L2, L2, X, R2

Outlaw 3
D.C Up, X, Triangle, Square, Down
Hangar 18 Right, Triangle, Left, Select, Start
North Pole L2, Up, Select, Start, Down
London R1, Triangle, L1, Left, L1
Tokyo X, Up, Start, L1, X
Egypt R1, Triangle, X, Square, X
Blimp Up, Start, Right, Down, Up

Roadkill
D.C R2, Start, L2, L2, Circle
Hangar 18 Triangle, R1, Triangle, Up, X
North Pole Square, Start, L1, Square, Right
London L1, Start, Start, R2, X
Tokyo Right, Triangle, Down, Circle, Start
Egypt L2, L1, Down, L1, L2
Blimp R1, Square, Circle, Right, Circle

Spectre
D.C Up, Triangle, Left, Circle, Up
Hangar 18 Up, R2, L1, L2, Select
North Pole Left, Up, R1, Up, Circle
London L2, R2, Circle, Square, L2
Tokyo Triangle, Down, Triangle, R1, Circle
Egypt Square, L2, Square, Down, Square
Blimp Select, R2, R2, Start, Right

Sweet Tooth
D.C L2, Select, R1, Select, R1
Hangar 18 R1, L1, Up, Up, Square
North Pole X, Square, Circle, Left, Start
London Left, Left, R1, Left, X
Tokyo Up, Square, Select, X, L1
Egypt Left, Left, R2, X, L2
Blimp L1, Square, Right, Circle, Circle

Thumper
D.C Square, X, Right, Triangle, L1
Hangar 18 Down, X, Select, X, Triangle
North Pole Right, X, Left, Start, Circle
London L2, Down, Select, Left, Right
Tokyo R1, X, R2, L1, R2
Egypt X, Right, Start, Circle, Circle
Blimp Circle, Triangle, Right, Circle, Square

Warthog
D.C Left, Circle, X, L2, R2
Hangar 18 L1, Right, L2, R1, Triangle
North Pole Circle, Triangle, Square, Select, L1
London Select, Up, L1, Up, Square
Tokyo Triangle, Start, Down, L2, Up
Egypt Right, Up, Triangle, R2, Triangle
Blimp L2, Triangle, Down, Circle, Select