To unlock all levels in the game put in the code.
Name your character LEVELS to get all levels.
Enter Cheat Mode (hold down A + B + Start) then do these cheats in game, without pausing.
Preferably, you should have your fists equipped, so you don't accidentally blow yourself up or anything.
While in a car, hold Up and release the gas. Your car will continue at the same speed you were at when beginning the sequence.
At main menu press: Left, Right, Up, Down, L, R, Hold start and press A. This will unlock a option that displays all the levels
Complete 12 Paramedic missions to never get tired when running.
As you collect the hidden packages, weapons will be delivered to your hideout.
Go to the character selection screen, highlight the name Kelly and change it to Sumner. You should unlock pictures of the design team.