Passwords: 2D Players
Enter SQUISHY at the Code screen.

Passwords: Beach Ball
Enter BEACHBOYS at the Code screen.

Passwords: Big Heads
Enter FATHEAD at the Code screen.

Passwords: Big Feet
Enter BIGFOOT at the Code screen.

Passwords: Evil Free throw Trick
If you really want to enrage your opponent, hit start when his free throw cursor is lined up. This will cause his cursor to start back at the original position. If you do this enough times he will eventually get a penalty for being at the foul line to long.

Passwords: Extra Teams
Go to the Options menu and then go to Codes. Enter the code DEVDUDES which will unlock the NBA2K, Sega Sports, and Sega teams. Code is case sensitive.

Passwords: Extra Point on Free Throw
When shooting your last free throw, you can control the center before the ball reaches the basket. Right after the ball leaves the shooter's hands, take control of the center and jump towards the hoop. He'll almost always catch the ball and dunk it before the ball even touches the rim. This will count as two points instead of one. It is almost like an alley-oop.

Passwords: Fat Players
Enter DOUGHBOY at the Code screen.

Passwords: Large Players
Enter MONSTER at the Code screen.

Passwords: Small Players
Enter LITTLEGUY at the Code screen.