Hold L1 + Triangle and press Right(2), Left, Up(3), Down, Left at the main menu.
All Players
Press R1+R2, left, down, right, up, R1+R2. The author of this code did not specify a location where to enter this combination.
All the grounds
To get all the grounds you have to win all the rule the street tournaments.
Easy GameBreakers
In most matches you will start with the ball in your possession. At this point, pass to a teammate who has good Trick skill. Have him run to your side of the pitch, near the keeper. Face the keeper, with your back to the rest of the players and the other team. Press Random Trick about three times while you are stationary. Immediately after the third one, a player from the other team will start to run at you. Stay with you back to him, but press Triangle when he is directly behind you. Note: Timing is important. You will most likely fake him out. After this, do another trick and immediately high pass to a player on your team. Keep high passing and you will be getting a lot of points. There are two options from here. You can eventually high pass to a player in the middle to try to score, or you can just keep high passing. If this is done correctly you will almost always get a GameBreaker.
Easy goals
When you are at the bottom left or right of the pitch, cross to a nearby player and head it. You will score about 95% of the time and about 60% of the time you will do a classy goal. Do many skills during a game. This enables a GameBreaker, which is a very easy way of scoring. You can score about 99% of the time.
Easy Skill Billz
When you have a good team in Rule The Street, go to the first course. Play that team and you will always win.
Long shot goal
Choose Worns and play with him. Shoot by pressing Circle and the direction where you want the ball to go. Before he takes the shot, hold L1. He should score from there.
Maximum speed, power, tackling, tricks, etc.
Hold L1 + Triangle and press Left(3), Up, Down(2).
Normal Size Players
Pause the game, and then hold down L1 + Triangle and press Right, Right, Up, Down, Down, Left, right, Left.
Small Players
Pause the game, and then hold down L1 + Triangle and press Up, Left, Down, Down, Right, Down, Up, Left.
Unlock all Apparel
Go to the Main Menu and then hold down L1 + Triangle and press Right, Right, Left, Up, Up, Up, Down, Left.