Cheat menu:
Enter the options menu and select "Gameplay". Hold D-pad Left + Left Analog-stick Right and press Start. The "Codes" selection will now be unlocked at the options menu.

Bonus teams:
Enter MEGASTARS as a case-sensitive code to unlock the Sega Sports, Visual Concepts, and Team 2K2 in exhibition and street modes.

Duotone graphics:
Enter DUOTONE as a case-sensitive code to have your player in color with all other players in black and white.

Trash in the streets:
Enter SPRINGER as a case-sensitive code to see trash in the streets. Note: This does not work in the gym.