Star the game as usual, go to the Cheats menu and then enter the following codes:

Code - Effect

SPEEDY01 - Unlimited Turbo
MAXSKILL - Max Skills
GM2OPEN8 - All Game Modes Open
A11T3AM5 - Unlock All Teams
WIMP A.I - Weak Opponents
Z26BEXW8 - Micro Soccer
5Y104D9A - Unlock Streetballers Team
E06J3CT5 - Add New Item to Environment