Pause the game and highlight the "Map" option. Then, press Up, Down, Up, Down, Triangle, X, Triangle, X, Square, Circle(2), Square. If you entered the code correctly, you will hear the sound of an engine.
Decrease RIOT level
Pause the game and highlight the "Map" option. Then, press Triangle, Circle, X, Square, Triangle, Circle, X, Square, Down. If you entered the code correctly, you will hear the sound of an engine.
Easy kills
If a gang of cops or rival gangs are coming after you, learn to drive and shoot in reverse. Back away from the cars about to explode or it will take off a lot of armour.
Easy money
Listen for the weather report on the radio. When you hear the report for the tornado warning, find the tornado and follow it from about a block back. You can pick up all the scavenger parts from the vehicles that the tornado destroys. For extra cash, try to induce a RIOT near the tornado. The increased traffic and constant stream of cops will give the tornado more toys to toss around and give you more cash.
Extra money
Pause the game and highlight the "Map" option. Then, press Triangle, Circle, Triangle, Circle, Square, X, Square, X, Down, Up. If you entered the code correctly, you will hear the sound of an engine.
Faster Upgrades
Stay by your garage and induce a riot by killing the civilians and other gangs. To get a riot faster, blast away the street cops. When your armor is running low, drop by garage and get repair kit. Repeat until you have enough money to upgrade. If you fail, do not start by loading the previous game. This will allow you to keep the money, no games penalites and you can keep your upgrades. You will only lose weapons.
Hint
If you are getting beat up by the swarm of cops that come out in full riot, go to the garage and park. The riot will be turned off. To save your progress, you will have to pull into the garage again.
Increase RIOT level
Pause the game and highlight the "Map" option. Then, press Triangle, Circle, X, Square, Triangle, Circle, X, Square, Up. If you entered the code correctly, you will hear the sound of an engine.
Infinite ammunition
Pause the game and highlight the "Map" option. Then, press Triangle, Square(2), Circle, Triangle, Square(2), Circle. If you entered the code correctly, you will hear the sound of an engine.
Other towns
When you progress enough, you will be taken to another city by following the "M" on the map. You can actually go back to the previous city at anytime. Pay attention to where exits are for the cities.
Restore health
Pause the game and highlight the "Map" option. Then, press Square, Circle, Square, Circle, Square, Circle, Square, Circle. If you entered the code correctly, you will hear the sound of an engine.
Tornado
Pause the game and highlight the "Map" option. Then, press Triangle, Circle, X, Square(2), X, Circle, Triangle. If you entered the code correctly, you will hear the sound of an engine.
Weapon power-ups respawn immediately
Pause the game and highlight the "Map" option. Then, press Triangle, X(2), Triangle, Square, Circle(2), Square, X, Square, Circle, Triangle. If you entered the code correctly, you will hear the sound of an engine. You still need to find where the original weapon power-up appears, then collect it again. It will also cause some weapons which you have not unlocked to appear next to your garage. However, not all weapon power-ups are next to your garage. They are usually nearby, but on a ledge or around the block.
