Cheat mode:
Enter DoggieStyle as a case-sensitive name to unlock all bonuses.

Super Cop mode:
Successfully complete story mode under the normal difficulty setting.

No damage mode:
Successfully complete the Roof Tops level in Super Cop mode.

Infinite ammo:
Successfully complete the Groove level in Super Cop mode.

Infinite adrenaline:
Successfully complete the Back Streets level in Super Cop mode.

All weapons:
Successfully complete the Villa level in Super Cop mode.

Incredibly fit dog mode:
Successfully complete the Under Rink level in Super Cop mode. This mode results in unlimited Shadow attacks.

Superdeform mode:
Successfully complete the Pink Starfish level in Super Cop mode. This mode results in big head, feet, and hands.

Normal Challenge mode:
Successfully complete story mode under the normal difficulty setting to unlock challenge mode with normal difficulty.

Fists Of Flame mode:
Successfully complete the Abattoir level in Super Cop mode.

Cabal Boss multi-player skin:
Successfully complete the Dock Yard level in Super Cop mode.

Maxine multi-player skin:
Successfully complete the Manson level in Super Cop mode.

Other multi-player skins and levels:
Successfully complete story mode under the normal difficulty setting. You will unlock a new skin or level for each level completed.

Biker 2 skin: Chapter 1
Bar level: Chapter 2
Biker Boss skin: Chapter 3
Triad 2 skin: Chapter 4
Jack 2 skin: Chapter 5
Triad Boss skin: Chapter 6
Militia 2 skin: Chapter 7
Militia Boss skin: Chapter 8
Cabal 1 skin: Chapter 9
Cabal 2 skin: Chapter 10
Mansion level: Chapter 11
Whisper skin: Chapter 12